Perhaps you should try some spelling variations:
china yang » china ying, china chang, china zhang
china wang » china chang, china zhang, china won
tang hang » tang tang, tang zheng, kang han
yang jun » pang jun, yang jin, yang judy
yang jui » yang judy, yang di, yang xi
tong hui » wang hui
leung » leong, lung, yeung

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: leung tang hang ((china yang) OR (china wang)) ((yang jun) OR (yang jui)) tong hui ;~.
• Adding a wildcard symbol may retrieve word variants: leung tang hang ((china yang) or (china wang)) ((yang jun) or (yang jui)) tong hui ;*.