To the OP, that particular serve is called a reverse pendulum serve. It is a pretty advanced serving technique, widely used by pro players from all over, not just China. To hit it effectively you need a really relaxed wrist, and it is almost impossible for most people, even top pros, to execute it if they strike the ball too far from their body. Try lifting your arm away from your body and then flopping your wrist (as if you were throwing a frisbee) compared to when the arm is more relaxed at your side. There are other reasons why the ball needs to be somewhat close to the body on that serve (but not too much), but this is one of them.
Actually because of this, most players who use this reverse pendulum serve tend to throw the ball into their body a bit, some to the point where umpires should probably be calling it illegal owing to deviations from verticality on toss. One of the few people who executes that serve with an almost perfectly straight toss is Timo Boll.
You'll notice that players who use hook serves of various sorts (like Per Gerrel and Stefan Fegerl) often throw the ball a little further out to the side. It is a quite different motion. Then again some (like Liu Shiwen) don't.
Fegerl is interesting to watch in this regard because he uses both the hook serve and the reverse pendulum serve so you can see how different his toss is on those two serving motions.