Vietnamese singer Nguyen Thi Ngoc Ha performs during the China-Vietnam Friendship Singing Contest 2019 Final in Hanoi, capital of Vietnam, Dec. 28, 2019. Nguyen Thi Ngoc Ha and Chinese singer Cao Yang won the first prize at the contest together on Saturday. (Xinhua/Wang Di)

Chinese singer Cao Yang (2nd R front) and Vietnamese singer Nguyen Thi Ngoc Ha (2nd L front), winners of the first prize at the China-Vietnam Friendship Singing Contest 2019 Final, pose for photos after receiving their awards in Hanoi, capital of Vietnam, Dec. 28, 2019. (Xinhua/Wang Di)