Perhaps you should try some spelling variations:
crisis sannong » crisis planning
during crisis » during crises, housing crisis
zhang zhang » zhen zhang, cheng zhang, zhang fang
wang liang » wang yang
der cost » oder cost, user cost, debt cost
eu cost » au costa, end cost, eu court

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 liang) OR (zhang zhang)) ying ((eu cost) OR (der cost)) during crisis sannong shu ;~.
• Adding a wildcard symbol may retrieve word variants: ((wang liang) or (zhang zhang)) ying ((eu cost) or (der cost)) during crisis sannong shu ;*.