Perhaps you should try some spelling variations:
wang yang » wang yan, wang liang, wang yanling
yang fang » yang yang, yang fan, yang guang
one agent » one parent, one event, one gene
gene one » gene clone, gene gene, gene we
und abu » und tabu, und ab, und abbau
und abs » und ab
fang a » fang _, lang a, facing a

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

• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang fang a ((one agent) OR (gene one)) gang ((und abu) OR (und abs)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang yang fang a ((one agent) or (gene one)) gang ((und abu) or (und abs)) ;*.