Perhaps you should try some spelling variations:
"supply grass conservation efforts." » "supply mass conservation efforts.", "supply forests conservation efforts.", "supply forest conservation efforts.", "supply gas conservation efforts.", "supply case conservation efforts.", "supply gap conservation efforts."
"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."

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

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