Perhaps you should try some spelling variations:
integration series » integration theories, integrating services, integration schemes
irrigation schemes » irrigation scheme, irrigation systems
crowd integration » grid integration, trade integration, chain integration
canal irrigation » scale irrigation
supply canal » supply annual, supply rural, supply case
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 canal irrigation schemes. ) OR ( supply crowd integration series. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply canal irrigation schemes. ) or ( supply crowd integration series. ))*.