Perhaps you should try some spelling variations:
den xiaoping » deng xiaoping, wang xiaoping, _ xiaoping
xiaoping tan » xiaoyang tang, xiaojing a, xiaoping _
tan chia » tuan china, than china, can china
chia tan » chia lan, chen tan, chia wen
yang yun » yang jun, tang yun, yang yue
yang fan » zhang fan, yang dean, yang yang

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: den xiaoping tan chia tan ((yang yun) OR (yang fan)) data (hai OR hari) ;~.
• Adding a wildcard symbol may retrieve word variants: den xiaoping tan chia tan ((yang yun) or (yang fan)) data (hai or hari) ;*.