Perhaps you should try some spelling variations:
gene yang » gene bank
yang hua » wang hua, yang hui, ying hua
hua gene » human gene, a gene, hua ren
yang jin » yang jie, yang jun, ying jin
wong sam » wong sau, wong lai, kong sar
wan yan » wang yan, wai yan, wang yang
nan yan » nan ya, wang yan, qian 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) OR (nan yan)) yang hua gene yang jin ((wong sam) OR (kong (sar OR sara))) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wan yan) OR (nan yan)) yang hua gene yang jin ((wong sam) or (kong (sar or sara))) ;~".
• Adding a wildcard symbol may retrieve word variants: ((wan yan) OR (nan yan)) yang hua gene yang jin ((wong sam) or (kong (sar or sara))) ;*.