Perhaps you should try some spelling variations:
"supply trade integration theories." » "supply trade integration theory.", "supply trade integration through.", "supply trade integration efforts.", "supply side integration theories.", "supply case integration theories."
"support what's importing countries." » "support what's exporting countries.", "support what's importing country.", "support what's important countries.", "support gas importing countries.", "support water 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: (("supply trade integration theories.") or ("support what's importing countries."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply trade integration theories.") OR ("support what's importing countries.")).
• Removing quotes may allow a broader search: (( supply trade integration theories. ) or ( support what's importing countries. )).
• Adding a wildcard symbol may retrieve word variants: (("supply trade integration theories.") or ("support what's importing countries."))*.