Perhaps you should try some spelling variations:
"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", "verse.bern.dt.gel.hno-heilkunde 15.15"
"verb.bern.dt.geld.hno-heilkunde 1991" » "verb.bern.dt.geld.hno-heilkunde 11", "verb.bern.dt.geld.hno-heilkunde 10", "verb.bern.dt.geld.hno-heilkunde 16", "verb.bern.dt.geld.hno-heilkunde 10991", "verb.bern.dt.geld.hno-heilkunde 11991", "verb.bern.dt.geld.hno-heilkunde 16991", "very.bern.dt.geld.hno-heilkunde 1991", "ver.bern.dt.geld.hno-heilkunde 1991", "vers.bern.dt.geld.hno-heilkunde 1991", "verb.been.dt.geld.hno-heilkunde 1991", "verb.born.dt.geld.hno-heilkunde 1991", "verb.bern.dt.gold.hno-heilkunde 1991"
"verh.ben.dt.geld.hno-heilkunde 1" » "verh.ben.dt.geld.hno-heilkunde 10", "verh.ben.dt.geld.hno-heilkunde 11", "verh.ben.dt.geld.hno-heilkunde 16", "verh.ben.dt.gold.hno-heilkunde 1", "very.ben.dt.geld.hno-heilkunde 1", "ver.ben.dt.geld.hno-heilkunde 1", "vers.ben.dt.geld.hno-heilkunde 1", "verh.been.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: (((("verb.bern.dt.geld.hno-heilkunde 1991") OR ("verh.ben.dt.geld.hno-heilkunde 1"))) OR ("verso.bern.dt.gel.hno-heilkunde 15.15")).
• Removing quotes may allow a broader search: (((( verb.bern.dt.geld.hno-heilkunde 1991 ) or ( verh.ben.dt.geld.hno-heilkunde 1 ))) or ( verso.bern.dt.gel.hno-heilkunde 15.15 )).
• Adding a wildcard symbol may retrieve word variants: (((("verb.bern.dt.geld.hno-heilkunde 1991") or ("verh.ben.dt.geld.hno-heilkunde 1"))) or ("verso.bern.dt.gel.hno-heilkunde 15.15"))*.