Perhaps you should try some spelling variations:
"supply trade integration theories." » "supply trade integration theorems.", "supply trade integrationstheorie 2.", "supply trade integration theory.", "supply case integration theories."
"support what's important country." » "support what's importing country.", "support what's important industry.", "support what's important monetary.", "support it's important country.", "support states important country.", "support chapter important country.", "support water important country."

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