Perhaps you should try some spelling variations:
"verb.bern.dt.gels.hno-heilkunde 1991" » "verb.bern.dt.gels.hno-heilkunde 15.15", "verb.bern.dt.gels.hno-heilkunde 10", "verb.bern.dt.gels.hno-heilkunde 16", "verb.bern.dt.gels.hno-heilkunde 10991", "verb.bern.dt.gels.hno-heilkunde 16991", "verb.bern.dt.gels.hno-heilkunde 18991", "ver.bern.dt.gels.hno-heilkunde 1991", "vers.bern.dt.gels.hno-heilkunde 1991", "verb.been.dt.gels.hno-heilkunde 1991", "verb.ben.dt.gels.hno-heilkunde 1991", "verb.bern.dt.gets.hno-heilkunde 1991", "verb.bern.dt.geld.hno-heilkunde 1991"
"very.born.dt.gel.hno-heilkunde 11" » "very.born.dt.gel.hno-heilkunde 10", "very.born.dt.gel.hno-heilkunde 16", "very.born.dt.gel.hno-heilkunde 18", "very.born.dt.gel.hno-heilkunde 101", "very.born.dt.gel.hno-heilkunde 161", "very.born.dt.gel.hno-heilkunde 181"
"very.born.dt.gel.hno-heilkunde 1" » "very.born.dt.gel.hno-heilkunde 10", "very.born.dt.gel.hno-heilkunde 16", "very.born.dt.gel.hno-heilkunde 18"

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.gels.hno-heilkunde 1991") OR ((("very.born.dt.gel.hno-heilkunde 11") OR ("very.born.dt.gel.hno-heilkunde 1")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"verb.bern.dt.gels.hno-heilkunde 1991\") or (((\"very.born.dt.gel.hno-heilkunde 11\") OR (\"very.born.dt.gel.hno-heilkunde 1\"))))".
• Removing quotes may allow a broader search: (( verb.bern.dt.gels.hno-heilkunde 1991 ) or ((( very.born.dt.gel.hno-heilkunde 11 ) OR ( very.born.dt.gel.hno-heilkunde 1 )))).
• Adding a wildcard symbol may retrieve word variants: (("verb.bern.dt.gels.hno-heilkunde 1991") or ((("very.born.dt.gel.hno-heilkunde 11") OR ("very.born.dt.gel.hno-heilkunde 1"))))*.