Perhaps you should try some spelling variations:
risk layering » risk laying, city layering
rent sharing » risk sharing, rent seeking
cost sharing » risk sharing, cost savings
wang yang » wang yan, wang liang, wang yanling
risk ying » risk laying, risk using, risk young
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) OR (cost sharing)) ((risk ying) OR (risk layering)) shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yang yi hua ((rent sharing) OR (cost sharing)) ((risk ying) or (risk layering)) shu ;~".
• Adding a wildcard symbol may retrieve word variants: wang yang yi hua ((rent sharing) OR (cost sharing)) ((risk ying) or (risk layering)) shu ;*.