Perhaps you should try some spelling variations:
"methoden 1 baer / gtt" » "methoden 3 baer / gtt", "methoden 2 baer / gtt", "methoden 1 barer / gtt", "methoden 12 baer / gtt", "methoden _ baer / gtt"
"methode von baer / gtt" » "methode von baden / gtt", "methode von bach / gtt", "methode von bank / 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: (((("methode von baer / gtt") OR ("methode von band / gtt"))) OR ("methoden 1 baer / gtt")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"methode von baer / gtt\") OR (\"methode von band / gtt\"))) or (\"methoden 1 baer / gtt\"))".
• Removing quotes may allow a broader search: (((( methode von baer / gtt ) OR ( methode von band / gtt ))) or ( methoden 1 baer / gtt )).
• Adding a wildcard symbol may retrieve word variants: (((("methode von baer / gtt") OR ("methode von band / gtt"))) or ("methoden 1 baer / gtt"))*.