Perhaps you should try some spelling variations:
crises china » crisis china's, classes china, crises asia
china stein » china shen, china step, china teil
wang yidan » wang yan
can costa » can cost, can postal, da costa
oder cost » der cost, lower cost, power cost
eu cost » au costa, der cost, end cost

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 yidan ying ((((eu cost) OR (can costa))) OR (oder cost)) during crises china stein ;~.
• Adding a wildcard symbol may retrieve word variants: wang yidan ying ((((eu cost) or (can costa))) or (oder cost)) during crises china stein ;*.