Perhaps you should try some spelling variations:
"methode vi bayes / gtt" » "methoden vi bayes / gtt", "methode von bayes / gtt", "methode 2 bayes / gtt", "methode die bayes / gtt", "methode ive bayes / gtt", "methode mit bayes / gtt"
"methode vi bases / gtt" » "methoden vi bases / gtt", "methode von bases / gtt", "methode 2 bases / gtt", "methode i bases / gtt", "methode ii bases / gtt", "methode vi based / gtt"
"methode 3 bayes / gtt" » "methode 2 bayes / gtt", "methode 4 bayes / gtt"

Try widening your search to All Fields.

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: (((("methode 3 bayes / gtt") OR ("methode _ bayes / gtt"))) OR ((("methode vi bayes / gtt") OR ("methode vi bases / gtt")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"methode 3 bayes / gtt\") OR (\"methode _ bayes / gtt\"))) or (((\"methode vi bayes / gtt\") or (\"methode vi bases / gtt\"))))".
• Removing quotes may allow a broader search: (((( methode 3 bayes / gtt ) OR ( methode _ bayes / gtt ))) or ((( methode vi bayes / gtt ) or ( methode vi bases / gtt )))).
• Adding a wildcard symbol may retrieve word variants: (((("methode 3 bayes / gtt") OR ("methode _ bayes / gtt"))) or ((("methode vi bayes / gtt") or ("methode vi bases / gtt"))))*.