Perhaps you should try some spelling variations:
ran yirong » ran ying
ying human » being human, using human, ying hua
human gene » human genome, human gender, human bone
liang tan » liang dan, liang sun, wing tan
kong saur » kong sar, kong siu, kong your
ying tan » wing tan, ying bank, ying yang
yang jin » yang jie, yang jun, ying jin

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

• Performing a fuzzy search may retrieve terms with similar spellings: ran yirong ying human gene ((((ying tan) or (liang tan))) or (yang jin)) kong saur ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ran yirong ying human gene ((((ying tan) OR (liang tan))) OR (yang jin)) kong saur ;.
• Adding a wildcard symbol may retrieve word variants: ran yirong ying human gene ((((ying tan) or (liang tan))) or (yang jin)) kong saur ;*.