Perhaps you should try some spelling variations:
"supply scale immigration policies." » "supply scale immigration policy.", "supply scale migration policy.", "supply scale migration policies.", "supply scale irrigation policies.", "supply scale integration policies.", "supply case immigration policies.", "supply scheme immigration policies.", "supply social immigration policies."
"supply crowd sanitation services." » "supply good sanitation services.", "supply food sanitation services.", "supply town sanitation services.", "supply growth sanitation services.", "supply cost sanitation services.", "supply from sanitation services."

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 scale immigration policies.") OR ("supply crowd sanitation services."))~.
• Removing quotes may allow a broader search: (( supply scale immigration policies. ) or ( supply crowd sanitation services. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply scale immigration policies.") or ("supply crowd sanitation services."))*.