All expats are gone from 330 now, with the exception of a couple of guys over 60 who were too old for the A350 conversion. The fleet is being retired, they're down to 5 aircraft now I think, 1 more goes to the desert next month, they'll all be gone within 12 - 18 months as the leases expire.
The 330NEO rumour still floats around, but at this stage it's just a rumour. I'd be very very very surprised if VNA was hiring 330 captains.
There IS a hot rumour that Vietjet are about to buy some 330s though, are you sure your agency is talking about the right airline?