Perhaps you should try some spelling variations:
"trubner methodischer leitfaden" » "uber methodische leitfaden", "erster methodischer leitfaden", "neuer methodischer leitfaden"
"grobner methods leitfaden" » "grobner methode leitfaden", "grobner rechts leitfaden", "greener methods leitfaden", "proper methods leitfaden", "frontier methods leitfaden"
"struktur technik leitfaden" » "struktur technische leitfaden", "kultur technik leitfaden"
"trubner methodik leitfaden" » "uber methodik leitfaden", "einer methodik leitfaden", "leber 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: (("struktur technik leitfaden") OR ((((("trubner methodik leitfaden") OR ("grobner methods leitfaden"))) OR ("trubner methodischer leitfaden")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"struktur technik leitfaden\") or (((((\"trubner methodik leitfaden\") OR (\"grobner methods leitfaden\"))) or (\"trubner methodischer leitfaden\"))))".
• Removing quotes may allow a broader search: (( struktur technik leitfaden ) or ((((( trubner methodik leitfaden ) OR ( grobner methods leitfaden ))) or ( trubner methodischer leitfaden )))).
• Adding a wildcard symbol may retrieve word variants: (("struktur technik leitfaden") or ((((("trubner methodik leitfaden") OR ("grobner methods leitfaden"))) or ("trubner methodischer leitfaden"))))*.