Viet Nam have fallen to 146th in the August FIFA world rankings, dropping 26 places from last month.
Thailand top Southeast Asian countries at 133rd, followed by Viet Nam, the Philippines (150th) and Malaysia (157th).
In Asia, Japan top the list in 20th, leaving behind Australia, South Korea, Iran and China.
Spain remain the No 1 team in the world. Germany and England are second and third, respectively.-VNS