Perhaps you should try some spelling variations:
"supply count immigration policies." » "supply count immigration policy.", "supply count migration policy.", "supply around immigration policies.", "supply country migration policies.", "supply und immigration policies.", "supply costs immigration policies.", "supply china immigration policies.", "supply cold immigration policies."
"supply cost integration social." » "supply cost international social.", "supply post integration social.", "supply test integration social.", "supply about integration social.", "supply costs integration social."

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply count immigration policies.") OR ("supply cost integration social."))~.
• Removing quotes may allow a broader search: (( supply count immigration policies. ) or ( supply cost integration social. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply count immigration policies.") or ("supply cost integration social."))*.