Perhaps you should try some spelling variations:
"supply through immigration policies." » "supply through immigration policy.", "supply through migration policy.", "supply through migration policies.", "supply through integration policies.", "supply through irrigation policies.", "supply throughout immigration policies.", "support through immigration policies."
"supply tool integration theories." » "supply tool integration theorems.", "supply tool integrationstheorie 2.", "supply tool integration theory.", "supply global integration theories.", "supply social integration theories.", "supply 3 integration theories.", "supply school integration theories.", "support tool integration theories.", "supply donor integration theories."

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply through immigration policies.") or ("supply tool integration theories."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply through immigration policies.") OR ("supply tool integration theories.")).
• Removing quotes may allow a broader search: (( supply through immigration policies. ) or ( supply tool integration theories. )).
• Adding a wildcard symbol may retrieve word variants: (("supply through immigration policies.") or ("supply tool integration theories."))*.