Perhaps you should try some spelling variations:
"support g integration theories." » "support g integration theorems.", "support g integrationstheorie 2.", "support g integration theory.", "support 3 integration theories.", "support 2 integration theories.", "support 4 integration theories.", "support _ integration theories.", "support a integration theories."
"support migrants integration some." » "support migrant integration some.", "support immigrants integration some.", "support migrants l'integration some.", "supporting migrants integration some.", "support grant integration some.", "support migrants integration south.", "support migrants integration soziale.", "support migrants integration social."

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