Perhaps you should try some spelling variations:
wang shiyong » wang hyoung
cheng zhang » cheng han, zhen zhang, china zhang
wang yuhan » wang luhang, wang yan, wang yidan
chen zheng » chen zhen, chen aizheng, chen zhe
box fig » box wing
fig sun » wing sun
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 yuhan) OR (wang shiyong)) fang a ((cheng zhang) OR (chen zheng)) box fig sun ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang yuhan) or (wang shiyong)) fang a ((cheng zhang) OR (chen zheng)) box fig sun ;~".
• Adding a wildcard symbol may retrieve word variants: ((wang yuhan) or (wang shiyong)) fang a ((cheng zhang) OR (chen zheng)) box fig sun ;*.