Perhaps you should try some spelling variations:
dong hoang » hong hong
chuan gene » human gene
yang yang » wang yang, wang yan
gene yang » gene bank
ka chuan » say chuan, hai chuan, ka chai
li zong » lin zong, li cong, li song
li rong » yi rong, li cong, li song

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)) ka chuan gene yang ((li zong) OR (li rong)) ghi ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong hoang) OR (yang yang)) ka chuan gene yang ((li zong) OR (li rong)) ghi ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong hoang) or (yang yang)) ka chuan gene yang ((li zong) OR (li rong)) ghi ;*".