Perhaps you should try some spelling variations:
"methode van bavel / gtt" » "methode von bavel / gtt", "methode v bavel / gtt", "methode vii bavel / gtt"
"methode vi bavel / gtt" » "methoden vi bavel / gtt", "methode von bavel / gtt", "methode 2 bavel / gtt", "methode vi based / gtt", "methode vi baked / gtt", "methode vi baden / 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 1 bavel / gtt" » "methode 2 bavel / gtt", "methode 3 bavel / gtt", "methode 5 bavel / gtt", "methode 1 basel / gtt", "methode 1 babel / gtt", "methode 1 bagels / gtt"
"methode 4 bavel / gtt" » "methode 2 bavel / gtt", "methode 3 bavel / gtt"

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 vi bases / gtt"))))) OR ((("methode 1 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 vi bases / gtt\"))))) or (((\"methode 1 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 vi bases / gtt ))))) or ((( methode 1 bavel / gtt ) or ( methode 4 bavel / gtt ))))*.