Perhaps you should try some spelling variations:
"methode vi bavel / gtt" » "methoden vi bavel / gtt", "methode von bavel / gtt", "methode 4 bavel / gtt", "methode van bavel / gtt", "methode vi based / gtt", "methode vi baked / gtt"
"methode 2 bavula / gtt" » "methode v bavula / gtt"
"methode 3 bavel / gtt" » "methode 3 basel / 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 vi bavel / gtt") OR ((("methode 3 bavel / gtt") OR ("methode 2 bavula / gtt"))))*.
• Removing quotes may allow a broader search: (( methode vi bavel / gtt ) or ((( methode 3 bavel / gtt ) or ( methode 2 bavula / gtt ))))*.