Perhaps you should try some spelling variations:
tuan human » than human, human human, run human
human gene » human genome, human gender, human bone
yan tuan » yan guan, yan yuan, anh tuan
yang jie » yang jin, yang di, yang jui
yang jun » yang jui, pang jun, yang jin
wong sam » wong sau, wong lai, kong sar
wan yan » wang yan, nan yan, wai yan

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: wan yan tuan human gene ((yang jie) OR (yang jun)) wong sam ;~.
• Adding a wildcard symbol may retrieve word variants: wan yan tuan human gene ((yang jie) or (yang jun)) wong sam ;*.