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

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