Perhaps you should try some spelling variations:
"verso.been.dt.gels.hno-heilkunde 15.15" » "verso.been.dt.gels.hno-heilkunde 5.1", "verso.been.dt.gels.hno-heilkunde 11", "verse.been.dt.gels.hno-heilkunde 15.15", "verso.been.dt.gel.hno-heilkunde 15.15", "verso.been.dt.gets.hno-heilkunde 15.15"
"verh.ben.dt.geld.hno-heilkunde 1991" » "verh.ben.dt.geld.hno-heilkunde 11", "verh.ben.dt.geld.hno-heilkunde 1", "verh.ben.dt.geld.hno-heilkunde 10", "very.ben.dt.geld.hno-heilkunde 1991", "ver.ben.dt.geld.hno-heilkunde 1991", "vers.ben.dt.geld.hno-heilkunde 1991", "verh.ben.dt.gold.hno-heilkunde 1991", "verh.ben.dt.gel.hno-heilkunde 1991"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("verh.ben.dt.geld.hno-heilkunde 1991") OR ("verso.been.dt.gels.hno-heilkunde 15.15")).
• Removing quotes may allow a broader search: (( verh.ben.dt.geld.hno-heilkunde 1991 ) or ( verso.been.dt.gels.hno-heilkunde 15.15 )).
• Adding a wildcard symbol may retrieve word variants: (("verh.ben.dt.geld.hno-heilkunde 1991") or ("verso.been.dt.gels.hno-heilkunde 15.15"))*.