Perhaps you should try some spelling variations:
"supply cost immigration policies." » "supply cost immigration policy.", "supply cost migration policy.", "supply gross immigration policies.", "supply first immigration policies.", "supply mass immigration policies.", "supply costs immigration policies."
"small countries leveraging policies." » "small countries emerging policies.", "small countries diverging policies.", "small countries developing policies.", "small countries learning 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 cost immigration policies.") or ("small countries leveraging policies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply cost immigration policies.") OR ("small countries leveraging policies.")).
• Removing quotes may allow a broader search: (( supply cost immigration policies. ) or ( small countries leveraging policies. )).
• Adding a wildcard symbol may retrieve word variants: (("supply cost immigration policies.") or ("small countries leveraging policies."))*.