Perhaps you should try some spelling variations:
wang yang » wang yan, wang liang, wang yanling
yang yang » wang yan
hua gene » human gene, hua ren, hy5 gene
ying jin » yang jin, jing ji, yang jie
long ago » long arm
long du » long d, long do, long run
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: wang yang yang ((hua gene) OR (a gene)) ying jin ((cong shu) OR (((long du) OR (long ago)))) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yang yang ((hua gene) OR (a gene)) ying jin ((cong shu) or (((long du) or (long ago)))) ;~".
• Adding a wildcard symbol may retrieve word variants: wang yang yang ((hua gene) OR (a gene)) ying jin ((cong shu) or (((long du) or (long ago)))) ;*.