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