Perhaps you should try some spelling variations:
wang yang » wang yan, wang liang, wang yanling
yang yan » yang yang, wang yan, yang fan
hua gene » human gene, a gene, hua ren
wong sau » wong sam, wong siu, wong shiu
yu chen » yu cheng, yi chen, yulu chen
yang yi » yang xi, yang jui
yan ji » yan jiu, ban ji, pan ji

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wang yang yan ((hua gene) or (yu chen)) ((yan ji) or (((yang yi) or (yang di)))) wong sau ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang yan ((hua gene) OR (yu chen)) ((yan ji) OR (((yang yi) OR (yang di)))) wong sau ;.
• Adding a wildcard symbol may retrieve word variants: wang yang yan ((hua gene) or (yu chen)) ((yan ji) or (((yang yi) or (yang di)))) wong sau ;*.