Even if the english is not there, the words Martial Arts or Kung Fu are pretty universal. They will most likely understand what you are talking about. It might be worse is you start butchering their language. With my experience in China and other asian countries I can say that the martial arts is better known in the general public and are far more widely accepted as a viable health giving practice than it is here, however not everyone practices or has a working knowledge of it. If you have an overwelming need to ask than ask politely .