Perhaps you should try some spelling variations:
"import trade integration through." » "import trade innovation through.", "export trade integration through.", "import taxes integration through.", "import share integration through."
"import price integration theory." » "import price information theory.", "import price innovation theory.", "import price intermediation theory.", "import service integration theory.", "import price indexation theory.", "import die integration theory.", "import prices integration theory.", "export price integration theory.", "export prices integration theory."

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

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