Perhaps you should try some spelling variations:
"support grid integration efforts." » "support grid international efforts.", "support grid conservation efforts.", "support agri integration efforts.", "support grant integration efforts.", "support group integration efforts."
"support crop irrigation systems." » "support drip irrigation systems.", "support scale irrigation systems.", "support canal irrigation systems.", "support crops irrigation systems.", "support cross irrigation systems.", "support across irrigation systems.", "support crop irrigation system."

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: (("support grid integration efforts.") OR ("support crop irrigation systems."))~.
• Removing quotes may allow a broader search: (( support grid integration efforts. ) or ( support crop irrigation systems. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support grid integration efforts.") or ("support crop irrigation systems."))*.