Perhaps you should try some spelling variations:
wing yan » wang yan, wing ian, wing tan
yan ying » fan ying, ran ying, tan ying
hua gene » human gene, hua ren, hy5 gene
yang jie » yang jin, yang di, yang jui
wong siu » wong shiu, kong siu, wong sau
yan jiu » yang jin, pang jiu
a gene » a genre, a gender, a gentle

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: wing yan ying ((hua gene) OR (a gene)) ((yan jiu) OR (yang jie)) ((wong lai) OR (wong siu)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wing yan ying ((hua gene) OR (a gene)) ((yan jiu) or (yang jie)) ((wong lai) or (wong siu)) ;~".
• Adding a wildcard symbol may retrieve word variants: wing yan ying ((hua gene) OR (a gene)) ((yan jiu) or (yang jie)) ((wong lai) or (wong siu)) ;*.