Perhaps you should try some spelling variations:
"methoden von bavel / gtt" » "methode von bavel / gtt", "methoden 2 bavel / gtt", "methoden van bavel / gtt", "methoden von babel / gtt", "methoden von gavel / gtt"
"methoden 1 babel / gtt" » "methoden 3 babel / gtt", "methoden 2 babel / gtt", "methoden 13 babel / gtt", "methoden 16 babel / gtt", "methoden 19 babel / 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: (("methoden von bavel / gtt") OR ("methoden 1 babel / gtt")).
• Removing quotes may allow a broader search: (( methoden von bavel / gtt ) or ( methoden 1 babel / gtt )).
• Adding a wildcard symbol may retrieve word variants: (("methoden von bavel / gtt") or ("methoden 1 babel / gtt"))*.