Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
gene yang » gene bank
shang hai » shang kai, dang hai, chang ha
yang min » yang mind, yang jin, tang min
hong hai » zhong tai, dang hai, hong tan
yang yi » yang di, yang jui
yang xi » yang di, yang jui
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: dong ((((yang yi) or (yang xi))) or (yang yang)) a gene yang min ((hong hai) OR (shang hai)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: dong ((((yang yi) OR (yang xi))) OR (yang yang)) a gene yang min ((hong hai) OR (shang hai)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "dong ((((yang yi) or (yang xi))) or (yang yang)) a gene yang min ((hong hai) OR (shang hai)) ;".
• Adding a wildcard symbol may retrieve word variants: dong ((((yang yi) or (yang xi))) or (yang yang)) a gene yang min ((hong hai) OR (shang hai)) ;*.