Perhaps you should try some spelling variations:
wang liang » wang yang
gene yang » gene bank
yang john » young john, king john, yang jin
john wong » john song, john bonn
wong sau » wong sam, wong siu, wong shiu
yan hua » ya hua, wang hua, tuan hua
tan hua » tuan hua, wang hua, tan chia

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: wang liang ((yan hua) OR (tan hua)) gene yang john wong sau ;~.
• Adding a wildcard symbol may retrieve word variants: wang liang ((yan hua) or (tan hua)) gene yang john wong sau ;*.