Perhaps you should try some spelling variations:
yang yang » wang yang
zhang yan » zhang fan, zhang jian
hua gene » human gene, a gene, hua ren
gene han » gene bank, gone hand
tin hong » tan hong, kia hong, thi hong
hong shu » cong shu, tong shui, wong shiu
yan hua » tan hua, ya hua, wang hua
han tin » han min

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((yang yang) or (((zhang yan) OR (wang yan)))) yan hua gene han tin hong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((yang yang) OR (((zhang yan) OR (wang yan)))) yan hua gene han tin hong shu ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((yang yang) or (((zhang yan) OR (wang yan)))) yan hua gene han tin hong shu ;".
• Adding a wildcard symbol may retrieve word variants: ((yang yang) or (((zhang yan) OR (wang yan)))) yan hua gene han tin hong shu ;*.