Perhaps you should try some spelling variations:
"supply curve integration series." » "supply curve integration theories.", "supply curve integrating services.", "supply curve integration schemes.", "supply care integration series.", "supply fare integration series.", "supply use integration series."
"supply border migration policies." » "supply border immigration policies.", "supply border migration policy.", "supply border education policies.", "supply worker migration policies.", "supply forced migration policies.", "supply under migration policies."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply curve integration series.") OR ("supply border migration policies."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"supply curve integration series.\") OR (\"supply border migration policies.\"))".
• Removing quotes may allow a broader search: (( supply curve integration series. ) OR ( supply border migration policies. )).
• Adding a wildcard symbol may retrieve word variants: (("supply curve integration series.") OR ("supply border migration policies."))*.