“他们的汉语水平如何?”用英语怎么说?

how about their Chinese?
我觉得这样就可以了，后面再加东西有点别扭。。
要是问口语怎样可以说
how about their oral Chinese?
和oral English是一个道理

what about their chinese level

What about his chinese spoken?

How they Chinese's skill?

how are their chinese levels?

how about their chinese skill?