Perhaps you should try some spelling variations:
"support flood irrigation schemes." » "support flood irrigation scheme.", "support flood irrigation systems.", "support flood mitigation schemes.", "support led irrigation schemes.", "support farm irrigation schemes.", "support food irrigation schemes.", "support look irrigation schemes.", "support follow irrigation schemes."
"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: (("support flood irrigation schemes.") or ("supply grid conservation efforts."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support flood irrigation schemes.") OR ("supply grid conservation efforts.")).
• Removing quotes may allow a broader search: (( support flood irrigation schemes. ) or ( supply grid conservation efforts. )).
• Adding a wildcard symbol may retrieve word variants: (("support flood irrigation schemes.") or ("supply grid conservation efforts."))*.