Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
grid information » good information, guided information, rapid information
crop irrigation » drip irrigation, scale irrigation, canal irrigation
supply crop » supply crowd, supply from, supply europe
supply grid » supply crowd, supply great, support grid

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply crop irrigation schemes. ) or ( supply grid information theory. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply crop irrigation schemes. ) OR ( supply grid information theory. )).
• Adding a wildcard symbol may retrieve word variants: (( supply crop irrigation schemes. ) or ( supply grid information theory. ))*.