Perhaps you should try some spelling variations:
yang guang » yang yang, yan guan, yang liang
known your » know your, knowing your, knock your
fang yuan » wang yuhan, wang yan, meng yuan
chain how » chains how
how known » now known, how knowing
li chen » jui chen
yi chen » jui chen

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: wan ((fang yuan) OR (yang guang)) ((li chen) OR (yi chen)) chain how known your ;~.
• Adding a wildcard symbol may retrieve word variants: wan ((fang yuan) or (yang guang)) ((li chen) or (yi chen)) chain how known your ;*.