Perhaps you should try some spelling variations:
dong sign » dong sin, among sign, dong bin
gene yang » gene bank
hua gene » human gene, a gene, hua ren
yang lin » yang jin, wang lin, yang li
zong ghi » hong ghi
dan cao » dan cao's, dong cao
dong di » dong sin
zong he » zheng he

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((dan cao) or (dong di))) or (dong sign)) ya hua gene yang lin ((zong ghi) or (zong he)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((dan cao) OR (dong di))) OR (dong sign)) ya hua gene yang lin ((zong ghi) OR (zong he)) ;.
• Adding a wildcard symbol may retrieve word variants: ((((dan cao) or (dong di))) or (dong sign)) ya hua gene yang lin ((zong ghi) or (zong he)) ;*.