Cambodian and Vietnamese both sound very funny and harsh. Vietnamese sounds like a cat yowling or a retarded duck that won't shut the fuck up.
Anyhow, I believe language, the structure and the general tone of it, truly reveals how a people are.
And I've never come across a people quite as scummy as Cambodians. Cambodians and Vietnamese people can be aggressive and confrontational especially when they get a feeling of inferiority complex. They are low IQ and prone to criminality (as with all SEAs). Lao people just as bad if not worst. Lao people are just a really trashy hillbilly version of Thai people really. And Thai people have their flaws as well such as being dull on average and criminal prone.
All south east asian language families sound like shit and the people are shit. Don't let your guard down and expect SEA to be as safe as East Asia.