Perhaps you should try some spelling variations:
"supply shadow immigration policies." » "supply shadow immigration policy.", "supply shadow migration policy.", "supply scale immigration policies.", "supply how immigration policies."
"support migrant integration schemes." » "support market integration schemes.", "support migrant irrigation schemes.", "support migrant integration some.", "support migrant integration theories.", "support grant integration schemes."

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 shadow immigration policies.") OR ("support migrant integration schemes."))~.
• Removing quotes may allow a broader search: (( supply shadow immigration policies. ) or ( support migrant integration schemes. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply shadow immigration policies.") or ("support migrant integration schemes."))*.