Let me summarise availability, at least as far as I can see from the UK:
In the Shadow of the Banyan by Vaddey Ratner, Cambodia
available as ebook from the usual sources
Noli Me Tangere by José Rizal, The Philippines
available in English translation from
Gutenberg
The Stones Cry Out: A Cambodian Childhood, 1975-1980 by Molyda Szymusiak, Cambodia
no ebook
Novel without a Name by Duong Thu Huong, Vietnam
no ebook
The Rainbow Troops by Andrea Hirati, Indonesia
ebook available from all the usual sources
The Sorrow of War: A Novel of North Vietnam by Bảo Ninh, Vietnam
ebook available from all the usual sources