Perhaps you should try some spelling variations:
"methode ive bayes / gtt" » "methode iv bayes / gtt", "methode iii bayes / gtt", "methode im bayes / gtt", "methode naive bayes / gtt", "methode die bayes / gtt", "methode de bayes / gtt"
"methode vi bayes / gtt" » "methoden vi bayes / gtt", "methode von bayes / gtt", "methode 2 bayes / gtt", "methode vi bases / gtt", "methode die bayes / gtt"
"methode vi based / gtt" » "methoden vi based / gtt", "methode von based / gtt", "methode 2 based / gtt", "methode ai based / gtt", "methode ni based / gtt", "methode si based / gtt"
"methode 3 bayes / gtt" » "methode 2 bayes / gtt", "methode _ bayes / gtt", "methode 4 bayes / gtt"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("methode 3 bayes / gtt") OR ((((("methode vi bayes / gtt") OR ("methode ive bayes / gtt"))) OR ("methode vi based / gtt")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"methode 3 bayes / gtt\") or (((((\"methode vi bayes / gtt\") OR (\"methode ive bayes / gtt\"))) or (\"methode vi based / gtt\"))))".
• Removing quotes may allow a broader search: (( methode 3 bayes / gtt ) or ((((( methode vi bayes / gtt ) OR ( methode ive bayes / gtt ))) or ( methode vi based / gtt )))).
• Adding a wildcard symbol may retrieve word variants: (("methode 3 bayes / gtt") or ((((("methode vi bayes / gtt") OR ("methode ive bayes / gtt"))) or ("methode vi based / gtt"))))*.