Perhaps you should try some spelling variations:
dong yang » dong hoang, wang yang, dan yang
yang yang » wang yang, wang yan
hua gene » human gene, a gene, hua ren
gene yan » gene bank, ren yan, see yan
wong sam » wong lai, kong sar, von sam
wong sau » wong siu, wong shiu, wong lai
yan ji » yan jiu, ban ji, pan ji

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((dong yang) OR (yang yang)) hua gene yan ji ((wong sam) OR (wong sau)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang ((dong yang) OR (yang yang)) hua gene yan ji ((wong sam) OR (wong sau)) ;*.