Perhaps you should try some spelling variations:
"uber methodischer leitfaden" » "uber methodische leitfaden", "oder methodischer leitfaden", "neuer methodischer leitfaden"
"trubner technik leitfaden" » "uber technik leitfaden", "trigger technik leitfaden", "struktur technik leitfaden"
"uber methodik leitfaden" » "leber methodik leitfaden", "der methodik leitfaden", "uber methoden 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 ((("uber methodik leitfaden") OR ("uber methodischer leitfaden"))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"trubner technik leitfaden\") or (((\"uber methodik leitfaden\") OR (\"uber methodischer leitfaden\"))))*".
• Removing quotes may allow a broader search: (( trubner technik leitfaden ) or ((( uber methodik leitfaden ) OR ( uber methodischer leitfaden ))))*.