Perhaps you should try some spelling variations:
dong hoang » hong hong
hua gene » human gene, a gene, hua ren
gene yan » gene bank, ren yan, see yan
wong sau » wong sam, wong siu, wong shiu
hong hai » shang hai, zhong tai, dang hai
ali hua » li hua, ali hala
yan jiu » yang jie, yang jin, pang jiu

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 ali hua gene yan jiu ((((wong sau) or (kong sar))) or (hong hai)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: dong hoang ali hua gene yan jiu ((((wong sau) OR (kong sar))) OR (hong hai)) ;.
• Adding a wildcard symbol may retrieve word variants: dong hoang ali hua gene yan jiu ((((wong sau) or (kong sar))) or (hong hai)) ;*.