THIS IS KNOWN AS MUAY BORAN. the ancient Thai boxing. Yes it does look like the Khmer fighting style, but that's because the two country lived close together and influences each other. Same can be said to the Burmese. The Burmese fighting style is very similar to that of the Thai or Khmer but they never claimed to have created the technique. Nobody knows who created the fighting style but we can say that a lot of the countries in south east asia uses it.