Perhaps you should try some spelling variations:
"supply mass immigration policies." » "supply mass immigration policy.", "supply mass migration policy.", "supply mass migration policies.", "supply _ immigration policies.", "supply case immigration policies.", "supply costs immigration policies.", "supply asset immigration policies."
"supply grid integration efforts." » "supply grid international efforts.", "supply grid conservation efforts.", "supply trade integration efforts.", "supply _ integration efforts.", "supply data integration efforts.", "supply crowd integration efforts.", "support 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 grid integration efforts.") or ("supply mass immigration policies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply grid integration efforts.") OR ("supply mass immigration policies.")).
• Removing quotes may allow a broader search: (( supply grid integration efforts. ) or ( supply mass immigration policies. )).
• Adding a wildcard symbol may retrieve word variants: (("supply grid integration efforts.") or ("supply mass immigration policies."))*.