Perhaps you should try some spelling variations:
"supply grid immigration policies." » "supply grid immigration policy.", "supply grid migration policy.", "supply gross immigration policies.", "supply grid integration policies.", "supply from immigration policies.", "supply crowd immigration policies.", "supply great immigration policies.", "support grid immigration policies."
"supply trade integration policies." » "supply trade international policies.", "supply trade migration policies.", "supply trade innovation policies.", "supply case integration policies."

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 immigration policies.") or ("supply trade integration policies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply grid immigration policies.") OR ("supply trade integration policies.")).
• Removing quotes may allow a broader search: (( supply grid immigration policies. ) or ( supply trade integration policies. )).
• Adding a wildcard symbol may retrieve word variants: (("supply grid immigration policies.") or ("supply trade integration policies."))*.