Perhaps you should try some spelling variations:
"support migrant integration theories." » "support migrant integration theorems.", "support migrant integrationstheorie 2.", "support migrant integration theory.", "support market integration theories.", "support migrants integration theories.", "support grant integration theories.", "supporting migrants integration theories."
"supply a integrated services." » "supply a internet services.", "supply 1 integrated services.", "supply 3 integrated services.", "supply 2 integrated services.", "supply _ integrated services."

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