Perhaps you should try some spelling variations:
"supply cost immigration policies." » "supply cost immigration policy.", "supply cost migration policy.", "supply gross immigration policies.", "supply first immigration policies.", "supply mass immigration policies.", "supply costs immigration policies."
"support grid conservation efforts." » "support aid conservation efforts.", "support good conservation efforts.", "support grass conservation efforts.", "support agri conservation efforts.", "support grant conservation efforts.", "support group conservation efforts."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("support grid conservation efforts.") or ("supply cost immigration policies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support grid conservation efforts.") OR ("supply cost immigration policies.")).
• Removing quotes may allow a broader search: (( support grid conservation efforts. ) or ( supply cost immigration policies. )).
• Adding a wildcard symbol may retrieve word variants: (("support grid conservation efforts.") or ("supply cost immigration policies."))*.