Perhaps you should try some spelling variations:
wang yang » wang yan, wang liang, wang yanling
gene dang » genre dans, gene bank
yan wang » yuan wang, yang yang, qian wang
yang hua » wang hua, yang hui, ying hua
hua gene » human gene, a gene, hua ren
hong sau » wong sau, hong paul, kong sar
wong sam » wong sau, wong lai, kong sar

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: yan wang yang hua gene dang hai ((hong sau) OR (wong sam)) ;~.
• Adding a wildcard symbol may retrieve word variants: yan wang yang hua gene dang hai ((hong sau) or (wong sam)) ;*.