Perhaps you should try some spelling variations:
"methode van bavel / gtt" » "methode von bavel / gtt", "methode v bavel / gtt", "methode vii bavel / gtt"
"methoden vi bavel / gtt" » "methoden v bavel / gtt", "methoden von bavel / gtt", "methoden 1 bavel / gtt", "methoden vi based / gtt", "methoden vi baked / gtt", "methoden vi bases / gtt"
"methode vi bavel / gtt" » "methode von bavel / gtt", "methode 2 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 van bavel / gtt") OR ((("methode vi bavel / gtt") OR ("methoden vi bavel / gtt")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"methode van bavel / gtt\") or (((\"methode vi bavel / gtt\") OR (\"methoden vi bavel / gtt\"))))".
• Removing quotes may allow a broader search: (( methode van bavel / gtt ) or ((( methode vi bavel / gtt ) OR ( methoden vi bavel / gtt )))).
• Adding a wildcard symbol may retrieve word variants: (("methode van bavel / gtt") or ((("methode vi bavel / gtt") OR ("methoden vi bavel / gtt"))))*.