A Distinct 4x6cm Format
Larger than the common international 35x45mm size, with shoulders visible.
Per Ministry of Foreign Affairs communication 696/BNG-LS, Vietnamese passport photos measure 4x6cm (40x60mm) -- noticeably larger than the 35x45mm size used by most other countries.
The framing is also different: rather than a tight headshot, the photo should be a close-up of your head and the top of your shoulders, with your face occupying roughly 70-80% of the frame.