Perhaps you should try some spelling variations:
xiaoping shi » xiaoling ji, xiaoping _, xiaoping how
ching wen » ching kwan, ching fein, ching hea
jia zhang » jie zhang, jia zhangke, xiao zhang
zhang hai » zhang dai, shang hai, zhang han
wen yang » wei yang, wen wang, chen yang
yang jia » yang jie, yang jin, yang jing

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 ((xiaoping shi) OR (mapping how)) ching wen yang jia zhang hai ;~.
• Adding a wildcard symbol may retrieve word variants: wang ((xiaoping shi) or (mapping how)) ching wen yang jia zhang hai ;*.