Perhaps you should try some spelling variations:
methodik leitfaden » methodischer leitfaden
trubner technik » uber technik, trigger technik, struktur technik
uber methodik » leber methodik, der methodik, uber methoden

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( trubner technik leitfaden ) OR ( uber methodik leitfaden )).
• Adding a wildcard symbol may retrieve word variants: (( trubner technik leitfaden ) or ( uber methodik leitfaden ))*.