Perhaps you should try some spelling variations:
"support agri integration theories." » "support agri integration theory.", "support agri integration through.", "support agri integration reforms.", "support grid integration theories.", "support fare integration theories.", "support care integration theories.", "support a integration theories."
"supply chain integration efforts." » "supply chain international efforts.", "supply chain conservation efforts.", "supply trade integration efforts.", "supply data integration efforts.", "supply grid integration efforts."

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 chain integration efforts.") OR ("support agri integration theories."))~.
• Removing quotes may allow a broader search: (( supply chain integration efforts. ) or ( support agri integration theories. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply chain integration efforts.") or ("support agri integration theories."))*.