Perhaps you should try some spelling variations:
lang yan » wang yan, wang yang, zhang yan
hua gene » human gene, a gene, hua ren
yang jui » yang di, yang xi, yang yi
wong sau » wong siu, wong shiu, wong lai
wong sam » wong lai, kong sar, von sam
yan yan » yan yuan, nan yan, yang yang
yan hua » tan hua, ya hua, wang hua

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