Vietnam had drawn 2-2 against New Zealand in their first game of the competition before holding Morocco to a 3-3 draw on March 30.
Against Iran, the Vietnamese team certainly did not lose their focus where they matched the world No. 7 side for much of the opening quarter before conceding in the 14th minute to a quick counterattack that was finished by Alii Khalivand.
Ali Asghar then finished from close range in the 19th minute to put the score at 2-0 for Iran.
Two minutes to the end, Behrooz fired in the third goal for Iran before Vietnam pulled a goal back thanks to Duc Hoa in the very last minute of play.
In the other match of the day, Morocco beat New Zealand 6-2 to be crowned the champions.
Held by the Vietnam Football Federation (VFF) in collaboration with the Ho Chi Minh City Football Federation, the tournament was a preparation for the Vietnamese team to play at the AFC Futsal Asian Cup 2024, slated for April 17-28 in Thailand. Vietnam is in the same group with host Thailand, China and Myanmar.