Perhaps you should try some spelling variations:
"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 v bavel / gtt" » "methode vi bavel / gtt", "methode 3 bavel / gtt", "methode 4 bavel / gtt", "methode van bavel / gtt", "methode v bavula / gtt"

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