A man of the Dao ethnic tribe rides a motorcycle across a bridge in Hoang Su Phi, north of Hanoi, Vietnam September 18, 2015. (Photo by Reuters/Kham)





A woman of the Dao ethnic tribal carries her grandson on her back while walking along a road in Hoang Su Phi, north of Hanoi, Vietnam September 18, 2015. (Photo by Reuters/Kham)





A man of the Nung ethnic tribe displays fish for sale by the roadside in Hoang Su Phi, north of Hanoi, Vietnam September 18, 2015. (Photo by Reuters/Kham)





Terraced rice paddy fields are seen during the harvest season in Hoang Su Phi, north of Hanoi, Vietnam September 18, 2015. (Photo by Reuters/Kham)





Vietnamese women of Hmong ethnicity sell piglets at a weekend market in Dong Van district, north of Hanoi, Vietnam September 20, 2015. (Photo by Reuters/Kham)





Hmong boys carry vegetation to prepared as animal feed back to their home in Ha Giang province, Vietnam September 20, 2015. (Photo by Reuters/Kham)





A Hmong woman rests along a road while she carries vegetation to be prepared as animal feed at Lung Cu village, which borders with China, in Ha Giang province, Vietnam September 20, 2015. (Photo by Reuters/Kham)





Rice paddy field is seen at Lung Cu village, which borders with China, in Ha Giang province, Vietnam September 20, 2015. (Photo by Reuters/Kham)





Pupils of the Hmong ethnic tribe wait for lunch at Van Chai school in Dong Van district of Vietnam's northern province of Ha Giang, located at the border with China, September 21, 2015. (Photo by Reuters/Kham)





Pupils of the Hmong ethnic tribe return home from school along a hillside path at Van Chai village in Dong Van district of Vietnam's northern province of Ha Giang, located at the border with China, September 21, 2015. (Photo by Reuters/Kham)





Pupils of the Dao ethnic tribe return home from school along a hillside path at Suoi Thau village in Hoang Su Phi district of Vietnam's northern province of Ha Giang, located at the border with China, September 18, 2015. (Photo by Reuters/Kham)





Hmong children play during a class break on a foggy day at Van Chai school in Dong Van district of Vietnam's northern province of Ha Giang, located on the border with China, September 21, 2015. (Photo by Reuters/Kham)





Lung Thi Nhi, 8, of the Giay ethnic tribe, rests along a roadside while looking after her buffalos in Yen Minh district of Vietnam's northern province of Ha Giang, located on the border with China, September 19, 2015. (Photo by Reuters/Kham)





A teacher serves food to pupils of the Hmong ethnic tribe during their lunch at Van Chai school in Dong Van district of Vietnam's northern province of Ha Giang, located on the border with China, September 21, 2015. (Photo by Reuters/Kham)





Women sort coffee beans at a coffee factory in Hanoi, Vietnam September 29, 2015. Trade in Vietnam's robusta coffee has been slowing as farmers are holding on to stocks and prohibitively high prices deterred importers from concluding deals, traders said on Tuesday. (Photo by Reuters/Kham)





Terraced rice paddy fields are seen during the harvest season in Mu Cang Chai, northwest of Hanoi October 3, 2015. (Photo by Reuters/Kham)





Vietnamese farmers of Hmong ethnic tribe pour rice into wind to separate low quality grains during the harvest season in Mu Cang Chai, northwest of Hanoi October 3, 2015. (Photo by Reuters/Kham)





Vietnamese farmers of Dao ethnic tribe harvest rice on a terraced rice paddy field during the harvest season in Tu Le, northwest of Hanoi October 3, 2015. (Photo by Reuters/Kham)





A Vietnamese farmer of Hmong ethnic tribe Hang A Dua uses an umbrella to cover his 4-months-old son Hang Trung Hieu from the sun on a terraced paddy field during the harvest season in Mu Cang Chai, northwest of Hanoi October 3, 2015. (Photo by Reuters/Kham)





A Vietnamese woman of Dao ethnic tribe harvests rice on a terraced rice paddy field during the harvest season in Tu Le, northwest of Hanoi October 3, 2015. (Photo by Reuters/Kham)





A Vietnamese woman of Hmong ethnic tribe carries a grass basket on a terraced rice paddy field during the harvest season in Mu Cang Chai, northwest of Hanoi October 3, 2015. (Photo by Reuters/Kham)





Terraced rice paddy fields are seen during the harvest season in Lim Mong, northwest of Hanoi October 3, 2015. (Photo by Reuters/Kham)





A couple of Hmong ethnic tribe carry rice on their backs while they return home with their children during the harvest season in Mu Cang Chai, northwest of Hanoi October 3, 2015. (Photo by Reuters/Kham)





Terraced rice paddy fields are seen during the harvest season in Lim Mong, northwest of Hanoi October 3, 2015. (Photo by Reuters/Kham)





A Vietnamese girl of Hmong ethnic tribe wipes her head while waiting for the return of her mother during the harvest season in Mu Cang Chai, northwest of Hanoi October 3, 2015. (Photo by Reuters/Kham)





A Vietnamese farmer of Hmong ethnic tribe pours rice into the wind to separate low quality grains during the harvest season in Mu Cang Chai, northwest of Hanoi October 3, 2015. (Photo by Reuters/Kham)





A Vietnamese woman of Hmong ethnic tribe carries her daughter while drying rice during the harvest season in Mu Cang Chai, northwest of Hanoi October 3, 2015. (Photo by Reuters/Kham)





Farmers from the Hmong ethnic tribe pour rice into the wind to separate low quality grains during harvest season in Mu Cang Chai, northwest of Hanoi, October 4, 2015. (Photo by Reuters/Kham)





A woman from the Muong ethnic tribe works on her green tea hills which produce black tea for export in Tan Son, outside Hanoi, October 4, 2015. A dozen Pacific nations closed in on a sweeping free trade pact on Sunday in Atlanta after a breakthrough over how long a monopoly pharmaceutical companies should be given on new biotech drugs. The trade pact, the Trans Pacific Partnership, or TPP, would lower tariffs and set common standards for 12 economies led by the United States and Japan, which together account for 40 percent of global output. (Photo by Reuters/Kham)





Vietnamese children shop for toys at a street in Hanoi, Vietnam 23 September 2015. Vietnamese people are going to celebrate the Mid-Autumn Festival, one of the most important traditional events during the year. Its a children's festival featuring moon cakes, paper lanterns, dragon dances. (Photo by Luong Thai Linh/EPA)





This picture taken on September 23, 2015, shows a vendor carrying a large bunch of star-shaped lanterns for sale at a local traditional mid-autumn festival toy market in downtown Hanoi. (Photo by Hoang Dinh Nam/AFP Photo)





Mechanics work at roadside shop specialized in repairing motorbike suspension systems in downtown Hanoi on September 17, 2015. (Photo by Hoang Dinh Nam/AFP Photo)