Perhaps you should try some spelling variations:
"supply side immigration policies." » "supply side immigration policy.", "supply side migration policy.", "supply scale immigration policies.", "supply race immigration policies.", "supply skilled immigration policies."
"supply tool integration efforts." » "supply tool international efforts.", "supply tool conservation efforts.", "supply global integration efforts.", "supply social integration efforts.", "supply trade integration efforts.", "supply school integration efforts.", "support tool 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 tool integration efforts.") or ("supply side immigration policies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply tool integration efforts.") OR ("supply side immigration policies.")).
• Removing quotes may allow a broader search: (( supply tool integration efforts. ) or ( supply side immigration policies. )).
• Adding a wildcard symbol may retrieve word variants: (("supply tool integration efforts.") or ("supply side immigration policies."))*.