Perhaps you should try some spelling variations:
human gene » human genome, human gender, human bone
dong sign » dong sin, among sign, dong bin
hua chen » jui chen, a chen, hua ren
bank jiu » bank aid, bank die
jiu cong » li cong
yu chen » yu cheng, yi chen, yulu chen
wang » wing, wan, lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((wang yan) or (dong sign)) ya ((human gene) or (((hua chen) OR (yu chen)))) bank jiu cong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang yan) OR (dong sign)) ya ((human gene) OR (((hua chen) OR (yu chen)))) bank jiu cong shu ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang yan) or (dong sign)) ya ((human gene) or (((hua chen) OR (yu chen)))) bank jiu cong shu ;".
• Adding a wildcard symbol may retrieve word variants: ((wang yan) or (dong sign)) ya ((human gene) or (((hua chen) OR (yu chen)))) bank jiu cong shu ;*.