Perhaps you should try some spelling variations:
trubner methodischer » uber methodische, erster methodischer, neuer methodischer
technik leitfaden » methodik leitfaden
struktur technik » struktur technische, kultur technik

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: (( struktur technik leitfaden ) OR ( trubner methodischer leitfaden ))*.