Perhaps you should try some spelling variations:
"export taxes integration theories." » "export taxes integration theorems.", "export taxes integrationstheorie 2.", "export taxes integration theory.", "export spaces integration theories.", "export values integration theories.", "export res integration theories."
"export prices integrating services." » "export prices integration services.", "export prices integrated services.", "export prices regulating services.", "export process integrating services.", "export policies integrating services.", "export services integrating services.", "import prices integrating services."

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