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