Perhaps you should try some spelling variations:
wang xiaoping » wang xiaodong, deng xiaoping, wang xiaolin
cheng zhang » cheng han, zhen zhang, chen zheng
cheng zhen » chen zhen, chen zhe, cheng han
wang xuan » wang xiuyan, wang xueman, wang yuhan
zhang yu » zhang y, zhang ya, zhang yi
wei cong » li cong, wei ming, wei wang

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) OR (wang xuan)) zhang yu ((cheng zhen) OR (cheng zhang)) wei cong shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang xiaoping) or (wang xuan)) zhang yu ((cheng zhen) OR (cheng zhang)) wei cong shu ;~".
• Adding a wildcard symbol may retrieve word variants: ((wang xiaoping) or (wang xuan)) zhang yu ((cheng zhen) OR (cheng zhang)) wei cong shu ;*.