Perhaps you should try some spelling variations:
costa sharing » data sharing, loss sharing, asia sharing
cost sharing » risk sharing, cost savings
zhang ying » zhang ming, zhang jing, zhang ting
zhang ping » zhang ming, zhang jing, zhang ting
best how » bust how, test how, west how
how shu » how she, how shih, how slum

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: cheng ((zhang ying) OR (zhang ping)) au ((costa sharing) OR (cost sharing)) best how shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "cheng ((zhang ying) or (zhang ping)) au ((costa sharing) OR (cost sharing)) best how shu ;~".
• Adding a wildcard symbol may retrieve word variants: cheng ((zhang ying) or (zhang ping)) au ((costa sharing) OR (cost sharing)) best how shu ;*.