Vy defeated Chinese Taipei's Lai Hui Shan 7-3, spoiling anall-Chinese Taipei showing on the final day of the qualifyingstages at the Star Billiards Centre.
She pounced on every miscue committed by Lai, including a crucial miss on the nine into the corner.
When Vy finally nailed the last ball, her few supporters in the audience gave her a thundering cheer.
"I came here without setting myself a high target," Duong said. "I onlywanted to do my best. This tournament is a good chance for me and myteammates to learn valuable experience. We don't have many competitionin Vietnam ."
Meanwhile, Lin Yuan Chun of ChineseTaipei, the former Amway World Women's Champion and a gold medallist atthe Doha Asian Games, made her way through to the main draw aftertrouncing compatriot Tsai Pei Chen 7-4.
Vietnam now has two representatives in the key round of the event, which takes place on April 7 and runs until April 11.
Nguyen Phuc Long, who made it through to the knockout stages of theWorld-8-ball Championship in the United Arab Emirates , is Vietnam's sole invited representative at the world-class tournament organisedby the international billiards governing body - the World Pool-BilliardAssociation.
Players from 30 countries will compete in both the men's and women's events. /.