Perhaps you should try some spelling variations:
"support migrants integration services." » "support migrant integration services.", "support immigrants integration services.", "support migrants l'integration services.", "support migrants integrating services.", "support migrants integrated services.", "support migrants insemination services.", "supporting migrants integration services.", "support grant integration services."
"support policy integrating science." » "support polity integrating science.", "support policy integration science.", "support policies integrating science.", "import policy integrating science."

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: (("support policy integrating science.") or ("support migrants integration services."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support policy integrating science.") OR ("support migrants integration services.")).
• Removing quotes may allow a broader search: (( support policy integrating science. ) or ( support migrants integration services. )).
• Adding a wildcard symbol may retrieve word variants: (("support policy integrating science.") or ("support migrants integration services."))*.