Perhaps you should try some spelling variations:
integration series » integration theories, integrating services, integration schemes
crowd integration » grid integration, trade integration, chain integration
furrow irrigation » farm irrigation, crop irrigation, flood irrigation
irrigation system » irrigation systems, irrigation water, irrigation scheme
supply crowd » supply growth, supply cost, supply how

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 crowd integration series. ) OR ( supply furrow irrigation system. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply crowd integration series. ) or ( supply furrow irrigation system. ))*.