Striker Nguyen Phong Hong Duy netted the first goal for Vietnam in the 10th minute. The goal is the second scored by Duy, who nabbed his first goal of the tournament against Indonesia on August 13.
However, the hosts managed to convert an opportunity at the 36th minute, with Vietnamese goal keeper Nguyen Van Toan failing to defend the net.
Striker Hoang Thanh Tung hit back in the 50th minute, scoring a second goal for Vietnam after a skilful steal from Cong Phuong.
A narrow miss at the 69th minute robbed Vietnam of an opportunity to consolidate their lead.
Striker Adi Said responded in the 75th minute with a victorious one-on-one joust with Vietnam's keeper.
The draw will see both teams share an equal opportunity to progress to the semi-final round, whereby Vietnam will need to topple Cambodia in its final match on August 18.
U19 Vietnam has defeated Singapore 4-0, lost to Malaysia 0-2 and toppled Indonesia 3-1 in its earlier Group B matches.