Perhaps you should try some spelling variations:
yuan wang » yan wang, yuan kang, yuan chang
wang wang » wang yang, wang liang, wang yan
hua gene » human gene, hua ren, hy5 gene
yang jin » yang jie, yang jun, ying jin
yang lin » wang lin, yang li, yang liang
yang xi » yang di, yang yi, yang jui
hong yu » wong yue
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: yuan wang wang ((hua gene) OR (a gene)) ((((yang xi) OR (yang jin))) OR (yang lin)) hong yu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yuan wang wang ((hua gene) OR (a gene)) ((((yang xi) or (yang jin))) or (yang lin)) hong yu ;~".
• Adding a wildcard symbol may retrieve word variants: yuan wang wang ((hua gene) OR (a gene)) ((((yang xi) or (yang jin))) or (yang lin)) hong yu ;*.