Perhaps you should try some spelling variations:
"support grid conservation efforts." » "support aid conservation efforts.", "support good conservation efforts.", "support grass conservation efforts.", "support agri conservation efforts.", "support group conservation efforts.", "support build conservation efforts."
"support grant irrigation system." » "support grant irrigation systems.", "support grant irrigation water.", "support grant irrigation scheme.", "support grain irrigation system.", "support gray irrigation system.", "support gravity irrigation system."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("support grid conservation efforts.") or ("support grant irrigation system."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support grid conservation efforts.") OR ("support grant irrigation system."))*.
• Removing quotes may allow a broader search: (( support grid conservation efforts. ) or ( support grant irrigation system. ))*.