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 irrigation schemes." » "support migrant integration schemes.", "support micro irrigation schemes.", "support mega irrigation schemes.", "support migrant irrigation scheme.", "support migrant irrigation systems.", "support grant irrigation 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 irrigation schemes."))~.
• Removing quotes may allow a broader search: (( supply shadow immigration policies. ) or ( support migrant irrigation schemes. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply shadow immigration policies.") or ("support migrant irrigation schemes."))*.