Perhaps you should try some spelling variations:
grid conservation » aid conservation, good conservation, grass conservation
irrigation system » irrigation systems, irrigation water, irrigation scheme
large irrigation » farm irrigation, drip irrigation, scale irrigation
supply large » supply charges, supply targets, supply curve
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 grid conservation efforts. ) or ( supply large irrigation system. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply grid conservation efforts. ) OR ( supply large irrigation system. )).
• Adding a wildcard symbol may retrieve word variants: (( supply grid conservation efforts. ) or ( supply large irrigation system. ))*.