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 2an bavel / gtt", "methode 3an bavel / gtt"
"methode 3an bavel / gtt" » "methode 3 bavel / gtt", "methode 3.1 bavel / gtt", "methode 3.4 bavel / gtt"
"methode v bavula / gtt" » "methode vi bavula / gtt", "methode 2 bavula / gtt", "methode 3 bavula / gtt", "methode v.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 van bavel / gtt") OR ("methode 3an bavel / gtt"))) OR ("methode v bavula / gtt")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"methode van bavel / gtt\") OR (\"methode 3an bavel / gtt\"))) or (\"methode v bavula / gtt\"))".
• Removing quotes may allow a broader search: (((( methode van bavel / gtt ) OR ( methode 3an bavel / gtt ))) or ( methode v bavula / gtt )).
• Adding a wildcard symbol may retrieve word variants: (((("methode van bavel / gtt") OR ("methode 3an bavel / gtt"))) or ("methode v bavula / gtt"))*.