@Dek *****
The problem is not the visa what which you will get, the problem is that the airport carrier maybe refuse you to leave because your return date is longer than the allowed 60 day on your visa ( without extension) if you got an outbound flight before 24 januari they will let you trough without problems, so book the Vietnam trip before you leave Last years airlines are getting tougher, you could phone them first to ask them what they allow