Perhaps you should try some spelling variations:
"import data integration theories." » "import data integration theory.", "import data integration through.", "import data integration efforts.", "import trade integration theories.", "import _ integration theories.", "import data integrity theories.", "import duty integration theories."
"import rates integrated services." » "import rates internet services.", "import water integrated services.", "import based integrated services.", "import croatia integrated services.", "import taxes integrated services.", "export rates integrated services.", "import sales integrated services."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("import data integration theories.") or ("import rates integrated services."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("import data integration theories.") OR ("import rates integrated services."))*.
• Removing quotes may allow a broader search: (( import data integration theories. ) or ( import rates integrated services. ))*.