Perhaps you should try some spelling variations:
"import taxes integration theories." » "import taxes integration theorems.", "import taxes integrationstheorie 2.", "import taxes integration theory.", "import spaces integration theories.", "import values integration theories.", "import res integration theories.", "export taxes integration theories."
"import trade integration series." » "import trade integration services.", "import trade interaction series.", "import trade integration server.", "export trade integration series.", "import price integration series.", "import share integration series."

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 series.") or ("import taxes integration theories."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("import trade integration series.") OR ("import taxes integration theories."))*.
• Removing quotes may allow a broader search: (( import trade integration series. ) or ( import taxes integration theories. ))*.