Perhaps you should try some spelling variations:
wang nana » wang yan, wang ning, wang ban
wang yang » wang yan, wang liang, wang yanling
jie zhang » jia zhang, li zhang, bin zhang
wei yang » pei yang, wei wang, wei yang's
jie song » jae song, jin song, kim song
a wei » a weit, ha wei, ma wei
et a » et al, et la, e a

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: ((wang nana) OR (wang yang)) et a wei yang ((jie song) OR (jie zhang)) yu ;~.
• Adding a wildcard symbol may retrieve word variants: ((wang nana) or (wang yang)) et a wei yang ((jie song) or (jie zhang)) yu ;*.