Perhaps you should try some spelling variations:
"support grant integration theories." » "support grant integration theory.", "support grant integration through.", "support grant integration efforts.", "support migrant integration theories.", "support trade integration theories.", "support grid integration theories."
"support south importing countries." » "support south exporting countries.", "support south importing country.", "support state importing countries.", "support young importing countries.", "supporting youth importing countries."

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

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