Perhaps you should try some spelling variations:
dong hoang » hong hong
chuan gene » human gene
yang yang » wang yang
gene yang » gene bank
ka chuan » say chuan, hai chuan, ka chai
yang lin » yang jin, wang lin, yang li
zong ghi » hong ghi
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: ((dong hoang) or (((yang yang) OR (wang yan)))) ka chuan gene yang lin ((zong ghi) or (zong he)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong hoang) OR (((yang yang) OR (wang yan)))) ka chuan gene yang lin ((zong ghi) OR (zong he)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong hoang) or (((yang yang) OR (wang yan)))) ka chuan gene yang lin ((zong ghi) or (zong he)) ;*".