In the past three editions of the Games in 2015, 2017 and 2019, Vietnam was ranked second in swimming, with most of the gold medals brought by Anh Vien.
Singapore has been ahead of the region in swimming, but Malaysia, Thailand, the Philippines and Indonesia have recently invested strongly in the sport.
The team is pinning hope on Nguyen Huy Hoang and Tran Hung Nguyen in men's events, and Le My Thao in women's. Pham Thi Van is a rising hopeful, as she has surpassed Anh Vien for four times in the recent three consecutive tournaments.
Swimming events are scheduled to run from May 14 to 19 atthe My Dinh Water Sports Stadium in Hanoi.