Perhaps you should try some spelling variations:
"support young integrating countries." » "support young importing countries.", "support young immigration countries.", "support young integrating culture.", "support count integrating countries.", "support china integrating countries.", "support now integrating countries.", "support south integrating countries."
"support migrant integration theories." » "support migrant integration theory.", "support migrant integration through.", "support migrant integration efforts.", "support market integration theories.", "support grant integration theories."

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