Perhaps you should try some spelling variations:
"import trade integrationstheorie 2." » "import der integrationstheorie 2.", "import eine integrationstheorie 2.", "import traditionelle integrationstheorie 2.", "import trade integrationstheorie fur.", "import trade integration theories.", "import trade interpretationstheorie 2.", "export trade integrationstheorie 2.", "import taxes integrationstheorie 2.", "import share integrationstheorie 2."
"import price integrating policies." » "import price integration policies.", "import price integrated policies.", "import price integrating positive.", "import process integrating policies.", "import period integrating policies.", "import prices integrating policies.", "export price integrating policies.", "export prices integrating policies."

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 trade integrationstheorie 2.") or ("import price integrating policies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("import trade integrationstheorie 2.") OR ("import price integrating policies.")).
• Removing quotes may allow a broader search: (( import trade integrationstheorie 2. ) or ( import price integrating policies. )).
• Adding a wildcard symbol may retrieve word variants: (("import trade integrationstheorie 2.") or ("import price integrating policies."))*.