Perhaps you should try some spelling variations:
yang guang » yang yang, yan guan, yang liang
known your » know your, knowing your, knock your
chen chan » chen chuan, cheung chan, chen chung
how known » now known, how knowing
yan yuan » yan guan, fang yuan, nan yan
chan how » chain how, change how, chains how
li 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 ((yan yuan) OR (yang guang)) li chen chan how known your ;~.
• Adding a wildcard symbol may retrieve word variants: wan ((yan yuan) or (yang guang)) li chen chan how known your ;*.