Perhaps you should try some spelling variations:
knowing about » known about, know about, knowing your
john knowing » how knowing, john bowring, john king
huang ting » huang jing, huang ying, huang bin
wang yang » wang yan, wang liang
fang wei » wang wei, zhang wei, liang wei
l king » _ king, 1 king, a king
wei l » wei li, wei lu, wei _

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) OR (wang yanling))) OR (huang ting)) fang wei l king john knowing about ;~.
• Adding a wildcard symbol may retrieve word variants: ((((wang yang) or (wang yanling))) or (huang ting)) fang wei l king john knowing about ;*.