Viet jet was stopped last month by the Vietnamese air authorities from further expansion because of a spotty safety record (near crashes/accidents)- it was in the news a few weeks back. The head of maintenance was dismissed as well as some other managers. A friend flew them from Bkk to CNX a few weeks ago - ground crew didn't seem to know what they were doing, flight crew as well. At your own risk...
Actually TransferWise does show as an International transfer. I've done it and so has a friend. 2 different banks. Shows in the bank record as an international transfer.