Vietnam hasn't hired DEC's to the 330 (or 777) for quite a few years now, they aren't growing the fleet so there's not much movement, and they prefer to promote A320 guys from within. All the action for new joiners is A320 / ATR only these days.
Lots of contract jobs going with the mainland airlines but if you don't wanna go there then I think both the Taiwanese airlines (EVA / China Airlines), and Air Hong Kong are your best bet right this moment.
Also, I'm not sure if it's still ongoing, but a few months ago there was a bunch of A330 DEC jobs going with Maskargo, could be worth a look, KL is probably my favourite city in Asia
