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 agri conservation efforts." » "support negro conservation efforts.", "support bird conservation efforts.", "support aid conservation efforts.", "support grid conservation efforts.", "support aging conservation efforts.", "support a 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 agri conservation efforts.") or ("supply cost immigration policies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support agri conservation efforts.") OR ("supply cost immigration policies.")).
• Removing quotes may allow a broader search: (( support agri conservation efforts. ) or ( supply cost immigration policies. )).
• Adding a wildcard symbol may retrieve word variants: (("support agri conservation efforts.") or ("supply cost immigration policies."))*.