Thailand into Nations Cup final
The hot weather may have played a role in making the match a quiet affair but the Thais squandered a host of chances following Nattawut Sombatyotha's early tap-in for the lead after just six minutes.
Pravee Tantataemee doubled the lead in the second half after heading in Chaiyawat Buran's free-kick in the 72nd minute, but in truth the second half was a drab affair.
"I'm not satisfied despite getting a win. I expected more and the players will need pick up things here and there," said Worrawoot.
"The strength of our players were not good ... the weather didn't help either. We had to slow the tempo down and make some changes here and there because our players were tiring out."
Worrawoot's Vietnamese counterpart Hoang Anh Tuan was also unhappy with his charges and he hoped the loss will be a lesson to his squad.
"It wasn't just the mistakes we made, I was not happy with many other things. The style of play was not good. But I hope everyone learns from this," said Anh Tuan.
"The third place on Sunday is not crucial. What is important is how we play. I want to see some improvements on Sunday."