Perhaps you should try some spelling variations:
"methode van bavel / gtt" » "methode von bavel / gtt", "methode vi bavel / gtt", "methode vii bavel / gtt", "methode vian bavel / gtt", "methode 3an bavel / gtt", "methode 4an bavel / gtt"
"methode v bavel / gtt" » "methode vi bavel / gtt", "methode 3 bavel / gtt", "methode 4 bavel / gtt"
"methode v bavula / gtt" » "methode vi bavula / gtt", "methode 3 bavula / gtt", "methode 4 bavula / gtt", "methode v.v bavula / gtt"
"methode 2 bavel / gtt" » "methode 2 babel / 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 van bavel / gtt") OR ((((("methode v bavel / gtt") OR ("methode v bavula / gtt"))) OR ("methode 2 bavel / gtt")))).
• Removing quotes may allow a broader search: (( methode van bavel / gtt ) or ((((( methode v bavel / gtt ) or ( methode v bavula / gtt ))) or ( methode 2 bavel / gtt )))).
• Adding a wildcard symbol may retrieve word variants: (("methode van bavel / gtt") or ((((("methode v bavel / gtt") or ("methode v bavula / gtt"))) or ("methode 2 bavel / gtt"))))*.