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

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