Perhaps you should try some spelling variations:
"methode van bavel / gtt" » "methode von bavel / gtt", "methode vom bavel / gtt", "methode viii bavel / gtt", "methode 2an bavel / gtt", "methode 3an bavel / gtt", "methode 4an bavel / gtt"
"methode vii bavel / gtt" » "methoden vii bavel / gtt", "method vii bavel / gtt", "methode von bavel / gtt", "methode voni bavel / gtt", "methode 2i bavel / gtt", "methode vii bases / gtt", "methode 2ii bavel / gtt", "methode 3ii bavel / gtt", "methode 4ii bavel / gtt"
"methods vii bavel / gtt" » "methods vi bavel / gtt", "methods via bavel / gtt", "methods v bavel / gtt", "methods vii bases / gtt"
"methode vi bavel / gtt" » "methoden vi bavel / gtt", "methode von bavel / gtt", "methode 2 bavel / gtt", "methode 2i bavel / gtt", "methode 3i bavel / gtt", "methode 4i bavel / gtt", "methode vi based / gtt", "methode vi baked / gtt", "methode vi bases / gtt"
"methode v bavel / gtt" » "methode 2 bavel / gtt", "methode 3 bavel / gtt", "methode 4 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.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("methode van bavel / gtt") OR ((("methode vii bavel / gtt") OR ("methods vii bavel / gtt"))))) OR ((("methode v bavel / gtt") OR ("methode vi bavel / gtt")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"methode van bavel / gtt\") or (((\"methode vii bavel / gtt\") OR (\"methods vii bavel / gtt\"))))) or (((\"methode v bavel / gtt\") or (\"methode vi bavel / gtt\"))))".
• Removing quotes may allow a broader search: (((( methode van bavel / gtt ) or ((( methode vii bavel / gtt ) OR ( methods vii bavel / gtt ))))) or ((( methode v bavel / gtt ) or ( methode vi bavel / gtt )))).
• Adding a wildcard symbol may retrieve word variants: (((("methode van bavel / gtt") or ((("methode vii bavel / gtt") OR ("methods vii bavel / gtt"))))) or ((("methode v bavel / gtt") or ("methode vi bavel / gtt"))))*.