Perhaps you should try some spelling variations:
wang zhang » wang zheng, wang luhang, zhang zhang
zhang ying » zhang ming, zhang jing, zhang ping
ying human » being human, using human, ying hua
human gene » human genome, human gender, human bone
liang tan » liang dan, liang sun, wing tan
ying tan » wing tan, ying bank, ying yang

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 ying human gene ((ying tan) OR (liang tan)) kong (sar OR star) ;~.
• Adding a wildcard symbol may retrieve word variants: wang zhang ying human gene ((ying tan) or (liang tan)) kong (sar or star) ;*.