Perhaps you should try some spelling variations:
risks playing » risk laying, risks facing, firms playing
rent sharing » risk sharing, rent seeking, cost sharing
risk using » risk during
wang yang » wang yan, wang liang, wang yanling
risk ying » risk laying, risk young, risks trying
hua rent » hua ren
yang yi » yang di, yang xi, yang jui
yi hua » li hua, ya hua, yi hui

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 yang yi hua rent sharing ((((risk ying) OR (risk using))) OR (risks playing)) shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yang yi hua rent sharing ((((risk ying) OR (risk using))) or (risks playing)) shu ;~".
• Adding a wildcard symbol may retrieve word variants: wang yang yi hua rent sharing ((((risk ying) OR (risk using))) or (risks playing)) shu ;*.