Perhaps you should try some spelling variations:
"verh.bern.dt.gels.hno-heilkunde 15.15" » "verh.bern.dt.gels.hno-heilkunde 5.1", "very.bern.dt.gels.hno-heilkunde 15.15", "verb.bern.dt.gels.hno-heilkunde 15.15", "vera.bern.dt.gels.hno-heilkunde 15.15", "verh.born.dt.gels.hno-heilkunde 15.15", "verh.bern.dt.gel.hno-heilkunde 15.15", "verh.bern.dt.gets.hno-heilkunde 15.15", "verh.bern.dt.geld.hno-heilkunde 15.15", "veryh.bern.dt.gels.hno-heilkunde 15.15", "everh.bern.dt.gels.hno-heilkunde 15.15", "vierh.bern.dt.gels.hno-heilkunde 15.15"
"verh.been.dt.gels.hno-heilkunde 15.15" » "verh.been.dt.gels.hno-heilkunde 5.1", "very.been.dt.gels.hno-heilkunde 15.15", "verb.been.dt.gels.hno-heilkunde 15.15", "vera.been.dt.gels.hno-heilkunde 15.15", "verh.been.dt.gel.hno-heilkunde 15.15", "verh.been.dt.gets.hno-heilkunde 15.15", "verh.been.dt.geld.hno-heilkunde 15.15", "veryh.been.dt.gels.hno-heilkunde 15.15", "everh.been.dt.gels.hno-heilkunde 15.15", "vierh.been.dt.gels.hno-heilkunde 15.15"
"vers.ben.dt.gels.hno-heilkunde 11" » "vers.ben.dt.gels.hno-heilkunde 1", "vers.ben.dt.gels.hno-heilkunde 10", "vers.ben.dt.gels.hno-heilkunde 16", "vers.ben.dt.gel.hno-heilkunde 11", "vers.ben.dt.gets.hno-heilkunde 11", "vers.ben.dt.geld.hno-heilkunde 11", "verse.ben.dt.gels.hno-heilkunde 11", "verso.ben.dt.gels.hno-heilkunde 11", "very.ben.dt.gels.hno-heilkunde 11", "verys.ben.dt.gels.hno-heilkunde 11", "evers.ben.dt.gels.hno-heilkunde 11", "viers.ben.dt.gels.hno-heilkunde 11"
"ver.ben.dt.gels.hno-heilkunde 11" » "ver.ben.dt.gels.hno-heilkunde 1", "ver.ben.dt.gels.hno-heilkunde 10", "ver.ben.dt.gels.hno-heilkunde 16", "ver.ben.dt.gel.hno-heilkunde 11", "ver.ben.dt.gets.hno-heilkunde 11", "ver.ben.dt.geld.hno-heilkunde 11", "very.ben.dt.gels.hno-heilkunde 11", "ever.ben.dt.gels.hno-heilkunde 11", "vier.ben.dt.gels.hno-heilkunde 11"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("verh.bern.dt.gels.hno-heilkunde 15.15") OR ((((("vers.ben.dt.gels.hno-heilkunde 11") OR ("ver.ben.dt.gels.hno-heilkunde 11"))) OR ("verh.been.dt.gels.hno-heilkunde 15.15")))).
• Removing quotes may allow a broader search: (( verh.bern.dt.gels.hno-heilkunde 15.15 ) or ((((( vers.ben.dt.gels.hno-heilkunde 11 ) or ( ver.ben.dt.gels.hno-heilkunde 11 ))) or ( verh.been.dt.gels.hno-heilkunde 15.15 )))).
• Adding a wildcard symbol may retrieve word variants: (("verh.bern.dt.gels.hno-heilkunde 15.15") or ((((("vers.ben.dt.gels.hno-heilkunde 11") or ("ver.ben.dt.gels.hno-heilkunde 11"))) or ("verh.been.dt.gels.hno-heilkunde 15.15"))))*.