Perhaps you should try some spelling variations:
wang xiaoping » wang xiaodong, deng xiaoping, wang xiaolin
xiaoping yang » xiaoyang tang
using doug » using drag, using drg
using due » using deep, using dual, using 7be
xi last » die last, his last, vi lasst
i last » _ last, a last, 3 last
sind » find, wind, kind

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 yang ((xi last) OR (i last)) thing ((using doug) OR (using due)) (sin OR sind) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang xiaoping yang ((xi last) OR (i last)) thing ((using doug) or (using due)) (sin or sind) ;~".
• Adding a wildcard symbol may retrieve word variants: wang xiaoping yang ((xi last) OR (i last)) thing ((using doug) or (using due)) (sin or sind) ;*.