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, hy5 gene
yang jin » yang jie, yang jun, ying jin
hong shu » cong shu, tong shui, wong shiu
hua ren » hua chen
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) OR (hua ren)) ((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) OR (hua ren)) ((yan jiu) OR (yang jin)) hong shu ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "done hoang tan ((hua gene) OR (hua ren)) ((yan jiu) or (yang jin)) hong shu ;".
• Adding a wildcard symbol may retrieve word variants: done hoang tan ((hua gene) OR (hua ren)) ((yan jiu) or (yang jin)) hong shu ;*.