Perhaps you should try some spelling variations:
"supply how immigration policies." » "supply how immigration policy.", "supply how migration policy.", "supply from immigration policies.", "supply does immigration policies.", "supply _ immigration policies.", "supply shock immigration policies."
"support migrant integration series." » "support market integration series.", "support migrant integration theories.", "support migrant integrating services.", "support migrant integration schemes.", "support grant integration series."

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 immigration policies.") or ("support migrant integration series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply how immigration policies.") OR ("support migrant integration series."))*.
• Removing quotes may allow a broader search: (( supply how immigration policies. ) or ( support migrant integration series. ))*.