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