Ask: What about Single/multies entry? (111,aa,)
Multiple is interpreted as multiple entries, not multiple applicants. Multiple entries means you are allowed to enter / exit Vietnam multiple times within a given period of time (1, 3 or 6 months). For example: 6 month multiple entry visa means - you are allowed to enter / exit Vietnam multitple times from the intended date of arrival provided plus 6 calendar consecutive months.