The Azkals made two successful kicks in the second half of the game after both teams failed to score in the first half.
Phil Younghusband scored the first goal on the 46th minute of the second half while Angel Guirado followed it up by scoring less than five minutes before the end of the game.
The Azkals' game against Myanmar was originally scheduled at the Rajamangala Stadium but the organizing committee change the venue last Thursday. Read more.
The game between Thailand and Vietnam took place at the the Rajamangala Stadium, the original venue where Thailand beat the Azkals in the opening day of the game.
Meanwhile, Vietnam lost to Thailand earlier to maintain its lead in Group A of the 2012 AFF Suzuki Cup tournament.
Azkals' coach Michael Weiss, who was suspended
after throwing the ball to a fallen Thai player in the opening day of the tournament, guided the Azkals in the semi-finals game clincher.
In the team standing for Group A
after three days of competition, Thailand leads with three wins with no loss followed by the Azkals with 2 wins with one loss while Vietnam and Myanmar have two losses with one draw each.
In Group B, Indonesia, Singapore and Malaysia have one win each while Laos has yet to score.
The Philippine Azkals will see action on December 8 against winner in Group B. Detailed result and semi-finals/finals schedules can be viewed here