Perhaps you should try some spelling variations:
integration theories » integration theory, integration through, integration efforts
irrigation system » irrigation systems, irrigation water, irrigation scheme
fare integration » market integration, trade integration, data integration
canal irrigation » scale irrigation
supply canal » supply annual, supply rural, supply case
supply fare » supply farm, supply case, supply market

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

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