Perhaps you should try some spelling variations:
done hoang » dong hoang
hoang tan » hong tan, huang tao, liang tan
hua gene » human gene, a gene, hua ren
yang jin » yang jie, yang jun, ying jin
hong shu » cong shu, tong shui, wong shiu
tan hua » tuan hua, wang hua, tan chia
yan jiu » yang jie, 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: done hoang tan hua gene ((yan jiu) or (yang jin)) hong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: done hoang tan hua gene ((yan jiu) OR (yang jin)) hong shu ;.
• Adding a wildcard symbol may retrieve word variants: done hoang tan hua gene ((yan jiu) or (yang jin)) hong shu ;*.