Perhaps you should try some spelling variations:
"supply social irrigation system." » "supply local irrigation system.", "supply scale irrigation system.", "supply social mitigation system.", "supply social irrigation systems.", "supply social irrigation water.", "supply social irrigation scheme."
"supply grid conservation efforts." » "supply aid conservation efforts.", "supply good conservation efforts.", "supply grass conservation efforts.", "supply crowd conservation efforts.", "supply great conservation efforts.", "support grid conservation efforts."

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 social irrigation system."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply grid conservation efforts.") OR ("supply social irrigation system.")).
• Removing quotes may allow a broader search: (( supply grid conservation efforts. ) or ( supply social irrigation system. )).
• Adding a wildcard symbol may retrieve word variants: (("supply grid conservation efforts.") or ("supply social irrigation system."))*.