Perhaps you should try some spelling variations:
"supply from immigration policies." » "supply from immigration policy.", "supply from migration policy.", "supply from migration policies.", "supply from imitation policies.", "supply from integration policies."
"supply charge conservation efforts." » "supply charge construction efforts.", "supply carbone conservation efforts.", "supply energy conservation efforts.", "supply charges conservation efforts.", "supply chain conservation efforts.", "supply chains 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: (("supply charge conservation efforts.") or ("supply from immigration policies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply charge conservation efforts.") OR ("supply from immigration policies."))*.
• Removing quotes may allow a broader search: (( supply charge conservation efforts. ) or ( supply from immigration policies. ))*.