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 v bavel / gtt" » "methode vi bavel / gtt", "methode 2 bavel / gtt", "methode 3 bavel / gtt", "methode v bavula / gtt"

Try widening your search to All Fields.

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

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