Perhaps you should try some spelling variations:
"support grid integration theories." » "support grid integration theory.", "support grid integration through.", "support grid integration reforms.", "support trade integration theories.", "support _ integration theories.", "support data integration theories.", "support agri integration theories.", "support grant integration theories.", "support group integration theories."
"supply chain integration efforts." » "supply chain international efforts.", "supply chain conservation efforts.", "supply trade integration efforts.", "supply data 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: (("support grid integration theories.") OR ("supply chain integration efforts."))~.
• Removing quotes may allow a broader search: (( support grid integration theories. ) or ( supply chain integration efforts. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support grid integration theories.") or ("supply chain integration efforts."))*.