Perhaps you should try some spelling variations:
"supply u.s immigration policies." » "supply u.s immigration policy.", "supply u.s migration policy.", "supply u.s migration policies.", "supply mass immigration policies.", "supply _ immigration policies.", "supply 1.3 immigration policies.", "supply 2.3 immigration policies.", "supply 3.3 immigration policies."
"supply process emigration policies." » "supply process migration policies.", "supply process integration policies.", "supply process education policies.", "supply gross emigration policies.", "supply process vibration policies.", "supply projects emigration policies.", "supply problems emigration policies.", "support process emigration 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 u.s immigration policies.") or ("supply process emigration policies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply u.s immigration policies.") OR ("supply process emigration policies."))*.
• Removing quotes may allow a broader search: (( supply u.s immigration policies. ) or ( supply process emigration policies. ))*.