Perhaps you should try some spelling variations:
"methode 2an bavel / gtt" » "methode 2.1 bavel / gtt", "methode 2.3 bavel / gtt", "methode 2.4 bavel / gtt", "methode van bavel / gtt"
"methode 2.2 bavel / gtt" » "methods 2.2 bavel / gtt", "method 2.2 bavel / gtt", "methode 2.1 bavel / gtt", "methode 2.2 base / gtt", "methode 2.2 bayes / gtt", "methode 2.2 bare / gtt"
"methode vi based / gtt" » "methoden vi based / gtt", "methode von based / gtt", "methode 3 based / gtt", "methode 3i based / gtt", "methode 4i based / gtt", "methode 1i based / gtt", "methode ai based / gtt", "methode ni based / gtt", "methode si based / gtt"
"methode v bavel / gtt" » "methode 3 bavel / gtt", "methode 4 bavel / gtt", "methode 1 bavel / gtt", "methode van bavel / gtt", "methode 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 2an bavel / gtt") OR ("methode 2.2 bavel / gtt"))) OR ("methode vi based / gtt"))) OR ("methode v bavel / gtt")).
• Removing quotes may allow a broader search: (((((( methode 2an bavel / gtt ) or ( methode 2.2 bavel / gtt ))) or ( methode vi based / gtt ))) or ( methode v bavel / gtt )).
• Adding a wildcard symbol may retrieve word variants: (((((("methode 2an bavel / gtt") or ("methode 2.2 bavel / gtt"))) or ("methode vi based / gtt"))) or ("methode v bavel / gtt"))*.