Perhaps you should try some spelling variations:
wang zhang » wang zheng, wang luhang, zhang zhang
human gene » human genome, human gender, human bone
zhang tan » zhang tian, zhang fan, zhang yan
yang jun » yang jui, pang jun, yang jin
wong sam » wong sau, wong lai, kong sar
hua ren » hua chen
yang xi » yang di, yang jui
yang yi » yang di, yang jui

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 zhang tan ((human gene) OR (hua ren)) ((((yang jun) OR (yang xi))) OR (yang yi)) wong sam ;~.
• Adding a wildcard symbol may retrieve word variants: wang zhang tan ((human gene) or (hua ren)) ((((yang jun) or (yang xi))) or (yang yi)) wong sam ;*.