Perhaps you should try some spelling variations:
integration theories » integration theory, integration through, integration efforts
furrow irrigation » farm irrigation, crop irrigation, flood irrigation
irrigation scheme » irrigation systems
case integration » care integration, fare integration, can integration
supply case » supply cost, supply chain, supply curve

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: (( supply case integration theories. ) OR ( supply furrow irrigation scheme. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply case integration theories. ) or ( supply furrow irrigation scheme. ))*.