Perhaps you should try some spelling variations:
"methoden von havel / gtt" » "methode von havel / gtt", "methoden 1 havel / gtt", "methoden 2 havel / gtt", "methoden von gavel / gtt", "methoden von hagel / gtt", "methoden von hagen / gtt"
"methoden von babel / gtt" » "methode von babel / gtt", "methoden 1 babel / gtt", "methoden 2 babel / gtt", "methoden von abel / gtt", "methoden von baden / gtt", "methoden von baer / 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: (("methoden von havel / gtt") OR ("methoden von babel / gtt"))*.
• Removing quotes may allow a broader search: (( methoden von havel / gtt ) or ( methoden von babel / gtt ))*.