Perhaps you should try some spelling variations:
yang guang » yang yang, yan guan, yang liang
known your » know your, knowing your, know you
knock your » know your
fang yuan » wang yuhan, wang yan, meng yuan
chen chan » chen chuan, cheung chan, chen chung
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 ((fang yuan) OR (yang guang)) li chen chan how ((known your) OR (knock your)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wan ((fang yuan) or (yang guang)) li chen chan how ((known your) OR (knock your)) ;~".
• Adding a wildcard symbol may retrieve word variants: wan ((fang yuan) or (yang guang)) li chen chan how ((known your) OR (knock your)) ;*.