At a trial in Ho Chi Minh City on March 26, the supreme court rejected all the appeals by Pham Thi Ngoc Tuyet, 42, Duong Van Chanh, 65, and his son Duong Quoc Nghia, 30.
They were sentenced by a court in the southern province last December. Other members of the ring, Ka Thuy Linh and her Chinese husband Dai Chang Sheng were sentenced to three years each. Six of their accomplices received jail terms of between two and seven years.
Only Tuyet, Chanh and Nghia appealed last year's ruling, saying they committed the crime due to limited legal knowledge.
The case was busted on June 4, 2014 when police caught Linh and Sheng at Ho Chi Minh City’s Tan Son Nhat International Airport attempting to send three Vietnamese women to China.
The couple’s confessions led to the arrests of Tuyet, the ring leader, and her accomplices.
Investigators found that Tuyet had asked Linh and her husband to bring Chinese men over to pick Vietnamese wives since 2013.
Linh, Sheng and another Chinese man, who is still at large, charged their Chinese clients 40,000 yuan (US$6,434) each. They paid Tuyet and her accomplices in Vietnam VND110 million (US$5,112) per client.
They successfully sent seven women abroad.