Perhaps you should try some spelling variations:
dong yang » dong hoang, wang yang, dan yang
yang yang » wang yang, wang yan
gene yang » gene bank
yang thi » dang thi, yang chik, yang di
thi hong » tan hong
hong ghi » zhong zhi, hong g, hong hai
a gene » a genre, a gender, a gentle
xi a » xi ai, i a, ii a

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) or (yang yang)) xi a gene yang thi hong ghi ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong yang) OR (yang yang)) xi a gene yang thi hong ghi ;.
• Adding a wildcard symbol may retrieve word variants: ((dong yang) or (yang yang)) xi a gene yang thi hong ghi ;*.