Perhaps you should try some spelling variations:
"supply factor integration theories." » "supply factor integration theorems.", "supply factor integrationstheorie 2.", "supply factor integration theory.", "supply facto integration theories.", "supply sector integration theories.", "supply actor interaction theories.", "supply factors integration theories."
"support migrant integration social." » "support market integration social.", "support migrant international social.", "support migrants integration social.", "support grant integration social.", "supporting migrants integration social."

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

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