The textbook does not mention Cambodia, Laos, Myanmar and Viet Nam, as well as the Thai Government during that time was committed to the stability of the nation, in the fight against the spread of communist doctrine.
Which is not mentioned, including Cambodia, Laos, Thailand, Vietnam and Myanmar, is the state during that time. Adhered to the national security in opposition to the expansion of communism.
The text does not mention Cambodia and Laos, Vietnam and Myanmar is the Thai state in that time. Stick to national security in opposition to the expansion of communism.