It's because, for the most part, Eastern Asian countries focus on reading English and less on speaking English. Sometimes even their writing can be a little lacking. That's why many of my family/friends can read and understand quite a lot but when they write/speak, it just doesn't seem to be as impressive. I don't think it's due to any fault of theirs. It's just the education system and how those countries go about teaching English. Most of them are very shy about speaking, too, which doesn't really help when native English speakers are trying to get a feel for their speaking level.

Chinese students think their oral English needs a lot of help. They are right. Because they must learn English in elementary school these days, they become pretty good spellers, and they learn the rules of grammar. However, there are many differences in their language compared to any other language. Their teachers are Chinese, who need pronunciation help themselves. They are doing what they need to to learn, and are getting better.

Yeah ! For elementary level students listening and speaking is too bad.

I want to know, as a Chsl(Chinese as Second Language), which is harder for you, reading, writing, speaking or listening?

yes, you're right.