Perhaps you should try some spelling variations:
gene tang » gene bank
yan yuan » yan guan, fang yuan, nan yan
yuan hua » tuan hua, yuan hui, tan hua
hua gene » human gene, a gene, hua ren
tang tin » tang min, tang tang, ting ting
wong yue » wang yue
wan yan » wang yan, nan yan, wai yan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wan yan yuan hua gene tang tin ((hong yu) or (wong yue)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wan yan yuan hua gene tang tin ((hong yu) OR (wong yue)) ;*.