Perhaps you should try some spelling variations:
"supply gap international political." » "supply gap international policy.", "supply law international political.", "supply war international political.", "supply can international political.", "supply a international political."
"supply male migration policies." » "supply male immigration policies.", "supply male migration policy.", "supply male education policies.", "supply female migration policies.", "supply mass migration policies.", "supply a migration policies.", "supply case migration policies.", "supply role migration policies.", "supply market 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 male migration policies.") OR ("supply gap international political."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"supply male migration policies.\") OR (\"supply gap international political.\"))".
• Removing quotes may allow a broader search: (( supply male migration policies. ) OR ( supply gap international political. )).
• Adding a wildcard symbol may retrieve word variants: (("supply male migration policies.") OR ("supply gap international political."))*.