The result, which matches the biggest scoreline in the tournament, was by no means a true reflection of the match itself.
The Vietnam players fought to the very end, but as the many chances they had all failed to hit its mark, the players spirits were clearly crushed.
The Thai players took advantage and began their plunder of goals.
“The players played to instruction and they were patient against a determined and well composed Vietnam team,” said Thai coach Anuruck Srikerd afterwards. “But the goal just before the break was the turning point. It demoralised our opponents and we could take advantage after that.”
In the first half, Thailand had a freekick some five metres from the top of the box. But skipper Sansern ballooned the shot over the crossbar. Vietnam took charge from then on and did most of the attacking.
But they were unable to break through the solid Thai defence.
The players form both sides were not as quick as they had been in the previous games but it could have been due to fatigue after more than 10 days of competition.
Among those affected were speedy striker Lam Thuan whom Vietnam coach Hoang Anh Tuan replaced in the 34th minute with Nguyen Tien Linh.
A few minutes later, Thai coach Anuruck Srikerd knew he needed more bite in attack and brought on skillful striker Jakkit Wachpirom.
Jakkit almost immediately made a difference when he connected a deep cross from Anon Amornlertsak. However, he was ruled offside. Jakkit’s replacement added the intended punch to the attack.
In the last minute of the first half, Skipper Worachit Kanitsribumphen scored in the last minute of the first half when his cracker took a deflection and swung into goal.
Just before the hour mark, Suksan Mungpao placed his shot in the far corner, just beyond the reach of custodian Nguyen Thanh Tuan.
The Vietnam players were not deterred by the goals and continued to fight back with Pham Trang Hoa and semifinals hattrick hero Ha Duc Minh trying to make their way through.
There was more celebration in the 69th minute as Ritthidet Phensawat made it 3-0. Still the Vietnamese did not stop fighting but their miss in the 80th minute was a testament of their luckless night.
Trong Hoa raced in down the right amd whipped is shot which hit the crossbar and bounce out. Nguyen Wuang Hai rused is for the rebound and managed to head it only for the ball to hit the post.
There was no stopping the Thais after that as Worachit added a second while the nippy Anon Amornlertsak hammered in two more to seal the final score at 6-0.
Meanwhile, the Thai national team showed its fighting spirit On Tuesday night (Sept 8) coming back from a two-goal deficit to share a point with Iraq in its World Cup Group F qualifying match.
Iraq looked too strong for the host as the visitors took two goals before and after the interval.
Justin Meramʼs shot outside the box 11 minutes before the break took the visitors in front and a header from striker Younus Mahood four minutes into the second half sealed the hope of the Thai national team to win the match.
The War Elephants looked settled after staying behind and they came back to the game after a spot kick by captain Theerathon Bunmathan 11 minutes from time reduced the deficit.
Mongkol Thoskraiʼs clinical shot three minutes later made it 2-2 as the almost 60,000 Thai fans packed in the stadium erupted.
The draw means Thailand have seven points from three matches and Iraq collected four points with a game in hand. It keeps alive the country's hopes to qulify for the World Cup.
The eight group winners and four best second-place teams advance to the continentʼs third and final qualifying round for Russia 2018.
Taiwan and Vietnam are the other two teams in the group in the Asia second qualifying round for the 2018 World Cup.