Perhaps you should try some spelling variations:
"import prices integrating services." » "import prices integrated services.", "import prices testing services.", "import prices integrating policies.", "import policies integrating services.", "import prices international services.", "import services integration services.", "input prices integrating services."
"import taxes integration theories." » "import taxes integration theory.", "import taxes integration through.", "import taxes integration efforts.", "import trade integration theories.", "import fare integration theories.", "import care integration theories.", "export taxes integration theories."

Try widening your search to All Fields.

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

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