Perhaps you should try some spelling variations:
"methoden vi bavel / gtt" » "methoden v bavel / gtt", "methoden von bavel / gtt", "methoden 1 bavel / gtt", "methoden vi based / gtt", "methoden vi baked / gtt", "methoden vi bases / gtt"
"methode van bavel / gtt" » "methode vi bavel / gtt", "methode vii bavel / gtt", "methode vom bavel / gtt", "methode vian bavel / gtt", "methode 2an bavel / gtt", "methode 3an bavel / gtt"
"methods vii bavel / gtt" » "methods vi bavel / gtt", "methods via bavel / gtt", "methods v bavel / gtt", "methods vii bases / gtt"
"methode von bavel / gtt" » "methode von babel / gtt", "methode von gavel / gtt", "methode von havel / gtt", "methode vion bavel / gtt", "methode 2on bavel / gtt", "methode 3on bavel / gtt"
"methode v bavel / gtt" » "methode vi bavel / gtt", "methode 2 bavel / gtt", "methode 3 bavel / gtt", "methode v bavula / gtt"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((((((("methode van bavel / gtt") OR ("methode von bavel / gtt"))) OR ("methoden vi bavel / gtt"))) OR ("methods vii bavel / gtt"))) OR ("methode v bavel / gtt")).
• Removing quotes may allow a broader search: (((((((( methode van bavel / gtt ) or ( methode von bavel / gtt ))) or ( methoden vi bavel / gtt ))) or ( methods vii bavel / gtt ))) or ( methode v bavel / gtt )).
• Adding a wildcard symbol may retrieve word variants: (((((((("methode van bavel / gtt") or ("methode von bavel / gtt"))) or ("methoden vi bavel / gtt"))) or ("methods vii bavel / gtt"))) or ("methode v bavel / gtt"))*.