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."
"support china integration culture." » "support china integration cultural.", "support china integrating culture.", "support china integrating cultural.", "support china's integration culture.", "support chip integration culture.", "support client integration culture.", "supply china integration culture."

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