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
case irrigation » scale irrigation, change irrigation, canal irrigation
supply fare » supply farm, supply market, supply curve
supply case » supply cost, supply chain, supply curve

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