I don't know anyone in Vietnam but Prinya Hom-Anek is based in Thailand and a good and experienced speaker on a variety of topics including cloud security : https://www.linkedin.com/in/prinyahomanek/
have you contacted members on ISC2 Asia-Pacific council:
https://www.isc2.org/About/Advisory-Council#accordion-ef39c0d3293f4ce5a2f368ba9f8623e0
of which, SC Leung is in HK, and a few in Singapore