In the Golden-23 arc, Vietnam was in the same group as Japan, Australia and Saudi Arabia in the last round of the Asian qualifiers for the Madrid olympics (Golden-23 arc, chapter 80, page 19).

Group C of the last round group stage of the Olympic asian qualifiers with Japan, Australia and Saudi Arabia (Golden-23 arc, chapter 80, pages 18-19)
Defeat 0-4 against Japan (away) (Golden-23 arc, chapter 80, page 12)
Defeat against Australia (Golden-23 arc, chapter 80, pages 18-19)
Defeat against Saudi arabia (Golden-23 arc, chapter 80, pages 18-19)
Defeat 0-5 against Australia (away) (Golden-23 arc, chapter 82, page 17)
Defeat 0-4 against Japan (home) (Golden-23 arc, chapter 84, pages 6-7)
Didn't qualify to the Madrid Olympics

No players known.

Defending the goal
They can gather in front of their goal to defend, which won't prevent Misugi or Matsuyama from scoring at middle range (Golden-23 arc, chapter 83, page 11), as well as Misaki (Golden-23 arc, chapter 83, page 15) and Sorimachi (Golden-23 arc, chapter 85, page 16).

No other information.