Perhaps you should try some spelling variations:
"methoden von baer / gtt" » "methoden 1 baer / gtt", "methoden 2 baer / gtt", "methoden von baden / gtt", "methoden von band / gtt", "methoden von bank / gtt"
"methode von bach / gtt" » "methode von band / 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 von bach / gtt") OR ("methoden von baer / gtt")).
• Removing quotes may allow a broader search: (( methode von bach / gtt ) or ( methoden von baer / gtt )).
• Adding a wildcard symbol may retrieve word variants: (("methode von bach / gtt") or ("methoden von baer / gtt"))*.