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 jie » yang jin, yang di, yang jui
hong shu » cong shu, tong shui, wong shiu
hua ren » hua chen
yan jiu » 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: done hoang tan ((hua gene) or (hua ren)) ((yan jiu) or (yang jie)) 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 jie)) hong shu ;.
• Adding a wildcard symbol may retrieve word variants: done hoang tan ((hua gene) or (hua ren)) ((yan jiu) or (yang jie)) hong shu ;*.