Perhaps you should try some spelling variations:
"support grid integration efforts." » "support grid international efforts.", "support grid conservation efforts.", "support trade integration efforts.", "support _ integration efforts.", "support data integration efforts.", "support agri integration efforts.", "support grant integration efforts.", "support group integration efforts."
"supply drop irrigation schemes." » "supply drop irrigation scheme.", "supply drop irrigation systems.", "supply drip irrigation schemes.", "supply crop irrigation schemes.", "supply from irrigation schemes.", "supply crowd irrigation schemes."

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

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