Taiwan - Silk, Double Vision, The Heirloom.
Philippines - Blood Island series (like Z pointed out...our very own Crabapple is a big fan of these flicks), Yam Laranas' Sigaw (aka) The Echo. Also dig up some other works of Eddie Romero if you can.
Indonesia - Mystics in Bali is one which will hit you like a real sucker punch. Lady Terminator is another.
Thailand - Faet (aka) Alone, Sick Nurses, Art of the Devil I & II, Nang Nak, Sars Wars, Re-Cycle, The Eye flicks, Buppah Rahtree, Dorm, Ghost of Mae Nak.
Not sure about any stuff from Laos, Cambodia or Vietnam. Thailand and Philippines are where all horror is at in South-east Asia.
I take it nobody has seen much of Indian horror. Trust me, there's a lot more to it than Bhoot. Early 80s stuff is very cheesy, but its pretty dark, gothic and atmospheric. Borrows a lot from Hammer.
http://www.amazon.com/Bollywood-Horr...8737840&sr=8-2
http://www.amazon.com/Bollywood-Horr...8737840&sr=8-1
http://www.amazon.com/Bollywood-Horr...8737840&sr=8-3
See if you can get those.