Perhaps you should try some spelling variations:
"methode van bavel / gtt" » "methode von bavel / gtt", "methode v bavel / gtt", "methode vii bavel / gtt"
"methods via bavel / gtt" » "method via bavel / gtt", "methods vi bavel / gtt", "methods vii bavel / gtt", "methods via travel / gtt", "methods via novel / gtt", "methods via wave / gtt"
"methode vi bases / gtt" » "methoden vi bases / gtt", "methode von bases / gtt", "methode 2 bases / gtt", "methode i bases / gtt", "methode ii bases / gtt", "methode vi based / gtt"
"methode 4 bavel / gtt" » "methode 2 bavel / gtt", "methode 3 bavel / 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 bases / gtt"))) OR ("methods via bavel / gtt"))) OR ("methode 4 bavel / gtt")).
• Removing quotes may allow a broader search: (((((( methode van bavel / gtt ) or ( methode vi bases / gtt ))) or ( methods via bavel / gtt ))) or ( methode 4 bavel / gtt )).
• Adding a wildcard symbol may retrieve word variants: (((((("methode van bavel / gtt") or ("methode vi bases / gtt"))) or ("methods via bavel / gtt"))) or ("methode 4 bavel / gtt"))*.