Perhaps you should try some spelling variations:
"export data integration theories." » "export data integration theory.", "export data integration through.", "export data integration efforts.", "export trade integration theories.", "export _ integration theories.", "export data integrity theories.", "export day integration theories.", "export ratio integration theories."
"import data lending services." » "import data nonlending services.", "import data planning services.", "import data banking services.", "import data linking services.", "import data handling services.", "import data shedding services.", "import duty lending services."

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

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