Perhaps you should try some spelling variations:
"methode vian bavel / gtt" » "methode van bavel / gtt", "methods avian bavel / gtt", "methode von bavel / gtt", "methode viian bavel / gtt", "methode 2ian bavel / gtt", "methode 4ian bavel / gtt"
"methode 3.4 bavel / gtt" » "method 3.4 bavel / gtt", "methods 3.4 bavel / gtt", "methode 3.1 bavel / gtt", "methode 3.4 base / gtt", "methode 3.4 baden / gtt"
"methode 3.4 bayes / gtt" » "method 3.4 bayes / gtt", "methods 3.4 bayes / gtt", "methode 3.1 bayes / gtt", "methode 3 bayes / gtt", "methode 1.5 bayes / gtt", "methode 2.1 bayes / gtt"
"methode v bavel / gtt" » "methode vi bavel / gtt", "methode 2 bavel / gtt", "methode 4 bavel / gtt", "methode van bavel / gtt", "methode v bavula / 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 vian bavel / gtt") OR ((("methode 3.4 bavel / gtt") OR ("methode 3.4 bayes / gtt"))))) OR ("methode v bavel / gtt")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"methode vian bavel / gtt\") or (((\"methode 3.4 bavel / gtt\") OR (\"methode 3.4 bayes / gtt\"))))) or (\"methode v bavel / gtt\"))".
• Removing quotes may allow a broader search: (((( methode vian bavel / gtt ) or ((( methode 3.4 bavel / gtt ) OR ( methode 3.4 bayes / gtt ))))) or ( methode v bavel / gtt )).
• Adding a wildcard symbol may retrieve word variants: (((("methode vian bavel / gtt") or ((("methode 3.4 bavel / gtt") OR ("methode 3.4 bayes / gtt"))))) or ("methode v bavel / gtt"))*.