I am scheduled to arrive at HAN on TG in C class at 9:35 AM from BKK.

Is the VN flight to HKG at 10:40 AM doable? And will I arrive and depart from the same terminal?

If I don't go to Hong Kong, but instead decide to connect to Siem Reap, Phnom Penh, or Luang Prabang, will all of those flights depart from the same terminal that I arrive in from BKK? What is the minimum international arrival to international departure connection time at HAN? And, will there be no immigration in all of the above cases at HAN?

And, what is the minimum connection time at HAN for international arrival to domestic Vietnam departure on VN, with the expected immigration check?

Thanks!