Perhaps you should try some spelling variations:
"trubner methodik leitfaden" » "trubner methodischer leitfaden", "einer methodik leitfaden", "grobner methods leitfaden", "leber methodik leitfaden"
"uber methodik leitfaden" » "uber methodischer leitfaden", "leber methodik leitfaden", "der methodik leitfaden", "uber methoden leitfaden"
"trubner technik leitfaden" » "uber technik leitfaden", "struktur technik leitfaden"
"trigger technik leitfaden" » "triggers technical leitfaden", "trigger mechanism 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 ("trigger technik leitfaden"))) OR ((("trubner methodik leitfaden") OR ("uber methodik leitfaden")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"trubner technik leitfaden\") OR (\"trigger technik leitfaden\"))) or (((\"trubner methodik leitfaden\") or (\"uber methodik leitfaden\"))))".
• Removing quotes may allow a broader search: (((( trubner technik leitfaden ) OR ( trigger technik leitfaden ))) or ((( trubner methodik leitfaden ) or ( uber methodik leitfaden )))).
• Adding a wildcard symbol may retrieve word variants: (((("trubner technik leitfaden") OR ("trigger technik leitfaden"))) or ((("trubner methodik leitfaden") or ("uber methodik leitfaden"))))*.