Perhaps you should try some spelling variations:
"supply national integration series." » "supply regional integration series.", "supply national innovation series.", "supply national integrity series.", "supply national integration theories.", "supply national integrating services.", "supply national integration schemes."
"export trade integration some." » "export trade integration volume.", "export trade integration power.", "export trade integration south.", "export share integration some.", "export taxes integration some.", "export price integration some."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("export trade integration some.") or ("supply national integration series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("export trade integration some.") OR ("supply national integration series."))*.
• Removing quotes may allow a broader search: (( export trade integration some. ) or ( supply national integration series. ))*.