Perhaps you should try some spelling variations:
"verh.ben.dt.gels.hno-heilkunde 1991" » "verh.ben.dt.gels.hno-heilkunde 11", "verh.ben.dt.gels.hno-heilkunde 15.15", "verh.ben.dt.gels.hno-heilkunde 1", "very.ben.dt.gels.hno-heilkunde 1991", "ver.ben.dt.gels.hno-heilkunde 1991", "verb.ben.dt.gels.hno-heilkunde 1991", "verh.been.dt.gels.hno-heilkunde 1991", "verh.ben.dt.gel.hno-heilkunde 1991", "verh.ben.dt.gets.hno-heilkunde 1991", "verh.ben.dt.geld.hno-heilkunde 1991"
"vers.bern.dt.gels.hno-heilkunde 1991" » "vers.bern.dt.gels.hno-heilkunde 11", "vers.bern.dt.gels.hno-heilkunde 15.15", "vers.bern.dt.gels.hno-heilkunde 1", "vers.bern.dt.gel.hno-heilkunde 1991", "vers.bern.dt.gets.hno-heilkunde 1991", "vers.bern.dt.geld.hno-heilkunde 1991", "verse.bern.dt.gels.hno-heilkunde 1991", "verso.bern.dt.gels.hno-heilkunde 1991", "very.bern.dt.gels.hno-heilkunde 1991", "vers.been.dt.gels.hno-heilkunde 1991", "vers.born.dt.gels.hno-heilkunde 1991"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("verh.ben.dt.gels.hno-heilkunde 1991") OR ("vers.bern.dt.gels.hno-heilkunde 1991")).
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