Perhaps you should try some spelling variations:
integration theories » integration theorems, integrationstheorie 2, integration theory
policy integration » political integration, policy international, policy intervention
irrigation schemes » irrigation scheme, irrigation systems
water irrigation » scale irrigation, canal irrigation, farm irrigation
support water » support chapter, support greater, support better
import policy » important policy, import price

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( support water irrigation schemes. ) or ( import policy integration theories. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( support water irrigation schemes. ) OR ( import policy integration theories. )).
• Adding a wildcard symbol may retrieve word variants: (( support water irrigation schemes. ) or ( import policy integration theories. ))*.