Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
chang jin » shang jin, chang min, zhang jin
yang yan » wang yan, yang fan, yang yao
hua gene » human gene, hua ren, hy5 gene
wong sau » wong sam, wong siu, wong shiu
won sau » wong sam, wong siu
a gene » a genre, a gender, a gentle

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wang ((yang yan) OR (yang yang)) ((hua gene) or (a gene)) chang jin ((won sau) or (wong sau)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((yang yan) OR (yang yang)) ((hua gene) OR (a gene)) chang jin ((won sau) OR (wong sau)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((yang yan) OR (yang yang)) ((hua gene) or (a gene)) chang jin ((won sau) or (wong sau)) ;*".