Perhaps you should try some spelling variations:
integration theories » integration theorems, integrationstheorie 2, integration theory
irrigation schemes » irrigation scheme, irrigation systems
crowd integration » grid integration, rfid integration, beyond integration
costs irrigation » systems irrigation, canal irrigation, crop irrigation
supply crowd » supply growth, supply cost, supply from

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 costs irrigation schemes. ) OR ( supply crowd integration theories. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply costs irrigation schemes. ) or ( supply crowd integration theories. ))*.