Perhaps you should try some spelling variations:
"supply gross immigration policies." » "supply gross immigration policy.", "supply gross migration policy.", "supply gross emigration policies.", "supply mass immigration policies.", "supply from immigration policies.", "supply process immigration policies.", "supply growth immigration policies.", "supply costs immigration policies."
"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.

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply chain integration efforts.") or ("supply gross immigration policies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply chain integration efforts.") OR ("supply gross immigration policies.")).
• Removing quotes may allow a broader search: (( supply chain integration efforts. ) or ( supply gross immigration policies. )).
• Adding a wildcard symbol may retrieve word variants: (("supply chain integration efforts.") or ("supply gross immigration policies."))*.