Mmm then I think I will not play with this and go with one passport all along. Just to be safe. But if I don't forget I will ask the person at the counter if it's allowed.
Hi, I went to Hanoi 5months ago. I showed a proof of accomodation on booking then cancelled it right away, just in case. Then a bank statement. It literally took me 5mins. You can search my post on this group, I made one stating what they asked me because to be honest I kinda forgot haha