Perhaps you should try some spelling variations:
"ver.ben.dt.geld.hno-heilkunde 16991" » "ver.ben.dt.geld.hno-heilkunde 11", "ver.ben.dt.geld.hno-heilkunde 16", "ver.ben.dt.geld.hno-heilkunde 106991", "ver.ben.dt.geld.hno-heilkunde 116991", "ver.ben.dt.geld.hno-heilkunde 166991", "ver.ben.dt.gold.hno-heilkunde 16991", "ever.ben.dt.geld.hno-heilkunde 16991", "vier.ben.dt.geld.hno-heilkunde 16991", "ver.been.dt.geld.hno-heilkunde 16991"
"verso.bern.dt.gel.hno-heilkunde 15.15" » "verso.bern.dt.gel.hno-heilkunde 5.1", "verso.bern.dt.gel.hno-heilkunde 11", "verso.bern.dt.gel.hno-heilkunde 105.15", "verso.bern.dt.gel.hno-heilkunde 115.15", "verso.bern.dt.gel.hno-heilkunde 165.15", "verso.been.dt.gel.hno-heilkunde 15.15", "verso.born.dt.gel.hno-heilkunde 15.15", "everso.bern.dt.gel.hno-heilkunde 15.15", "vierso.bern.dt.gel.hno-heilkunde 15.15", "verse.bern.dt.gel.hno-heilkunde 15.15"
"very.bern.dt.geld.hno-heilkunde 1" » "very.bern.dt.geld.hno-heilkunde 10", "very.bern.dt.geld.hno-heilkunde 11", "very.bern.dt.geld.hno-heilkunde 16", "very.been.dt.geld.hno-heilkunde 1", "very.born.dt.geld.hno-heilkunde 1", "very.bern.dt.gold.hno-heilkunde 1", "every.bern.dt.geld.hno-heilkunde 1", "viery.bern.dt.geld.hno-heilkunde 1"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("very.bern.dt.geld.hno-heilkunde 1") OR ("ver.ben.dt.geld.hno-heilkunde 16991"))) OR ("verso.bern.dt.gel.hno-heilkunde 15.15")).
• Removing quotes may allow a broader search: (((( very.bern.dt.geld.hno-heilkunde 1 ) or ( ver.ben.dt.geld.hno-heilkunde 16991 ))) or ( verso.bern.dt.gel.hno-heilkunde 15.15 )).
• Adding a wildcard symbol may retrieve word variants: (((("very.bern.dt.geld.hno-heilkunde 1") or ("ver.ben.dt.geld.hno-heilkunde 16991"))) or ("verso.bern.dt.gel.hno-heilkunde 15.15"))*.