Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
grid information » good information, guided information, rapid information
gas irrigation » gray irrigation, basin irrigation, grain irrigation
supply grid » supply crowd, supply great, support grid
supply gas » supply gap, supply case, supply a

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

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