Perhaps you should try some spelling variations:
"supply shadow integrating countries." » "supply shadow importing countries.", "supply shadow immigration countries.", "supply shadow integrating culture.", "supply shallow integration countries.", "supply how integrating countries."
"supply mass immigration policies." » "supply mass immigration policy.", "supply mass migration policy.", "supply mass migration policies.", "supply _ immigration policies.", "supply case immigration policies.", "supply costs immigration policies.", "supply asset immigration 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 shadow integrating countries.") or ("supply mass immigration policies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply shadow integrating countries.") OR ("supply mass immigration policies."))*.
• Removing quotes may allow a broader search: (( supply shadow integrating countries. ) or ( supply mass immigration policies. ))*.