Perhaps you should try some spelling variations:
gene clone » gene one
clone than » closer than
yuan kang » yuan wang, yuan chang, chan kang
than hong » tan hong, thang long, than one
yang hui » yang jui, wang hui, yang muxi
hong sar » kong sar, hong seo, hong tan
yang yi » yang di, yang xi, yang jui

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 kang ((yang hui) OR (yang yi)) gene clone than hong sar ;~.
• Adding a wildcard symbol may retrieve word variants: yuan kang ((yang hui) or (yang yi)) gene clone than hong sar ;*.