Perhaps you should try some spelling variations:
"methods vii bavel / gtt" » "methods vi bavel / gtt", "methods via bavel / gtt", "methods v bavel / gtt", "methods van bavel / gtt", "methods vii bases / gtt"
"methode vom bavel / gtt" » "methoden vom bavel / gtt", "methode von bavel / gtt", "methode vii bavel / gtt", "methode vom braven / gtt", "methode van bavel / gtt", "methode vom bail / gtt", "methode 2om bavel / gtt", "methode 3om bavel / gtt", "methode 4om bavel / gtt"
"methode vi bases / gtt" » "methoden vi bases / gtt", "methode von bases / gtt", "methode 2 bases / gtt", "methode 2i bases / gtt", "methode 3i bases / gtt", "methode 4i bases / gtt", "methode i bases / gtt", "methode ii bases / gtt", "methode vi based / gtt"
"methode v bavula / gtt" » "methode 2 bavula / gtt", "methode 3 bavula / gtt", "methode 4 bavula / gtt", "methode v.v bavula / 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 vom bavel / gtt") OR ("methode vi bases / gtt"))) OR ("methods vii bavel / gtt"))) OR ("methode v bavula / gtt")).
• Removing quotes may allow a broader search: (((((( methode vom bavel / gtt ) or ( methode vi bases / gtt ))) or ( methods vii bavel / gtt ))) or ( methode v bavula / gtt )).
• Adding a wildcard symbol may retrieve word variants: (((((("methode vom bavel / gtt") or ("methode vi bases / gtt"))) or ("methods vii bavel / gtt"))) or ("methode v bavula / gtt"))*.