Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
integration series » integration theories, integrating services, integration schemes
urban integration » european integration, global integration, trade integration
supply scale » supply case, supply scheme, supply social
supply urban » supply rural

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 scale irrigation schemes. ) OR ( supply urban integration series. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply scale irrigation schemes. ) or ( supply urban integration series. ))*.