Perhaps you should try some spelling variations:
"methode van bavel / gtt" » "methode von bavel / gtt", "methode vi bavel / gtt", "methode vii bavel / gtt", "methode vian bavel / gtt", "methode 2an bavel / gtt", "methode 3an bavel / gtt"
"methode v.v bavula / gtt" » "methode von bavula / gtt", "methode 4.2 bavula / gtt", "methode 3.1 bavula / gtt", "methode vi.v bavula / gtt", "methode 2.v bavula / gtt", "methode 3.v bavula / gtt"
"methode v bavel / gtt" » "methode vi bavel / gtt", "methode 2 bavel / gtt", "methode 3 bavel / gtt"
"methode v bavula / gtt" » "methode vi bavula / gtt", "methode 2 bavula / gtt", "methode 3 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 v bavel / gtt") OR ((("methode v bavula / gtt") OR ("methode v.v bavula / gtt")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"methode van bavel / gtt\") or (((\"methode v bavel / gtt\") or (((\"methode v bavula / gtt\") OR (\"methode v.v bavula / gtt\"))))))".
• Removing quotes may allow a broader search: (( methode van bavel / gtt ) or ((( methode v bavel / gtt ) or ((( methode v bavula / gtt ) OR ( methode v.v bavula / gtt )))))).
• Adding a wildcard symbol may retrieve word variants: (("methode van bavel / gtt") or ((("methode v bavel / gtt") or ((("methode v bavula / gtt") OR ("methode v.v bavula / gtt"))))))*.