Perhaps you should try some spelling variations:
"supply gross immigration policies." » "supply gross immigration policy.", "supply gross migration policy.", "supply gross emigration policies.", "supply mass immigration policies.", "supply from immigration policies.", "supply growth immigration policies.", "supply costs immigration policies.", "supply cost immigration policies."
"support aid conservation efforts." » "support land conservation efforts.", "support bird conservation efforts.", "support wild conservation efforts.", "support add conservation efforts.", "support david 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 aid conservation efforts.") or ("supply gross immigration policies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support aid conservation efforts.") OR ("supply gross immigration policies.")).
• Removing quotes may allow a broader search: (( support aid conservation efforts. ) or ( supply gross immigration policies. )).
• Adding a wildcard symbol may retrieve word variants: (("support aid conservation efforts.") or ("supply gross immigration policies."))*.