Bui Tran Tuan Anh scored a hat trick for Vietnam in the match.
Anh is currently the top scorer of the event, which is being organised in Kuantan, Pahang Darulmakmur, Malaysia.
Inthe final being played on October 30, Vietnam will meet Malaysia, whobeat Thailand in the other semi-final match. Laos will play Thailand forthe third place.
Eight teams, including the Philippines,Thailand, Vietnam and invited team Felda Malaysia played to qualify forthe Asian Championships, which will be organised by the Asian FootballConfederation in April next year.
The top two teams at the AFF championship will also qualify for the Asian Championships.-VNA