Perhaps you should try some spelling variations:
"support africa irrigation schemes." » "support africa irrigation scheme.", "support africa irrigation systems.", "support africa immigration schemes.", "support syria irrigation schemes.", "support drip irrigation schemes.", "supporting africa irrigation schemes.", "supply africa irrigation schemes.", "support price irrigation schemes."
"support grid conservation efforts." » "support aid conservation efforts.", "support good conservation efforts.", "support grass conservation efforts.", "support agri conservation efforts.", "support grant conservation efforts.", "support group 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 africa irrigation schemes.") or ("support grid conservation efforts."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support africa irrigation schemes.") OR ("support grid conservation efforts.")).
• Removing quotes may allow a broader search: (( support africa irrigation schemes. ) or ( support grid conservation efforts. )).
• Adding a wildcard symbol may retrieve word variants: (("support africa irrigation schemes.") or ("support grid conservation efforts."))*.