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 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 van bavel / gtt" » "methode von bavel / gtt", "methode v bavel / gtt", "methode vii bavel / gtt"
"methode vi bavel / gtt" » "methoden vi bavel / gtt", "methode von bavel / gtt", "methode 3 bavel / gtt", "methode vi based / gtt", "methode vi baked / gtt", "methode vi bases / gtt"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• 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 bavel / gtt"))) OR ("methode van bavel / gtt")).
• Removing quotes may allow a broader search: (((((( methode 2an bavel / gtt ) or ( methode 2.2 bavel / gtt ))) or ( methode vi bavel / gtt ))) or ( methode van bavel / gtt )).
• Adding a wildcard symbol may retrieve word variants: (((((("methode 2an bavel / gtt") or ("methode 2.2 bavel / gtt"))) or ("methode vi bavel / gtt"))) or ("methode van bavel / gtt"))*.