Perhaps you should try some spelling variations:
"methode van bavel / gtt" » "methode vii bavel / gtt", "methode vom bavel / gtt", "methode viii bavel / gtt", "methode 2an bavel / gtt", "methode 3an bavel / gtt", "methode 1an bavel / gtt"
"methode vi bavel / gtt" » "methoden vi bavel / gtt", "methode 2 bavel / gtt", "methode 3 bavel / gtt", "methode 2i bavel / gtt", "methode 3i bavel / gtt", "methode 1i bavel / gtt", "methode vi based / gtt", "methode vi baked / gtt", "methode vi bases / gtt"
"methode von bavel / gtt" » "methode von babel / gtt", "methode von gavel / gtt", "methode von havel / gtt", "methode 2on bavel / gtt", "methode 3on bavel / gtt", "methode 1on bavel / gtt"
"methode v bavel / gtt" » "methode 2 bavel / gtt", "methode 3 bavel / gtt", "methode 1 bavel / gtt", "methode v bavula / 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 bavel / gtt") OR ("methode von bavel / gtt"))))) OR ((("methode v bavel / gtt") OR ("methode 4 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 (\"methode von bavel / gtt\"))))) or (((\"methode v bavel / gtt\") or (\"methode 4 bavel / gtt\"))))".
• Removing quotes may allow a broader search: (((( methode van bavel / gtt ) or ((( methode vi bavel / gtt ) OR ( methode von bavel / gtt ))))) or ((( methode v bavel / gtt ) or ( methode 4 bavel / gtt )))).
• Adding a wildcard symbol may retrieve word variants: (((("methode van bavel / gtt") or ((("methode vi bavel / gtt") OR ("methode von bavel / gtt"))))) or ((("methode v bavel / gtt") or ("methode 4 bavel / gtt"))))*.