Perhaps you should try some spelling variations:
technik leitfaden » methodik leitfaden
trubner methodik » uber methodik, grobner methods, leber methodik
trubner technik » uber technik, trigger technik, struktur technik
einer methodik » eine methodik, einer methode, der methodik

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((\\"trubner technik leitfaden\\") or (\\"((trubner methodik) OR (einer methodik)) leitfaden\\"))\"".
• Removing quotes may allow a broader search: (( trubner technik leitfaden ) or ( ((trubner methodik) OR (einer methodik)) leitfaden )).