Perhaps you should try some spelling variations:
"supply change immigration policies." » "supply change immigration policy.", "supply change migration policies.", "supply chinese immigration policies.", "supply changes migration policies.", "supply charges immigration policies.", "supply channels immigration policies.", "supply chain's immigration policies."
"supply expert migration policy." » "supply expat migration policy.", "supply repeat migration policy.", "supply poverty migration policy.", "supply expert education policy.", "supply experts migration policy.", "supply export migration policy.", "supply effect migration policy."

You may be able to get more results by adjusting your search query.

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