Perhaps you should try some spelling variations:
"supply race immigration policies." » "supply race immigration policy.", "supply race migration policy.", "supply scale immigration policies.", "supply mass immigration policies.", "supply gross immigration policies.", "supply reach immigration policies.", "supply case immigration policies.", "supply role immigration policies."
"supply how integration efforts." » "supply how international efforts.", "supply how conservation efforts.", "supply power integration efforts.", "supply tool integration efforts.", "supply _ integration efforts.", "supply shock 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 how integration efforts.") or ("supply race immigration policies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply how integration efforts.") OR ("supply race immigration policies.")).
• Removing quotes may allow a broader search: (( supply how integration efforts. ) or ( supply race immigration policies. )).
• Adding a wildcard symbol may retrieve word variants: (("supply how integration efforts.") or ("supply race immigration policies."))*.