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"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("methode _ bayes / gtt") OR ((("methode vi bayes / gtt") OR ("methode vi bases / gtt")))).
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