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

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.bern.dt.geld.hno-heilkunde 1991 ) OR ((( vers.been.dt.geld.hno-heilkunde 1991 ) OR ( very.been.dt.geld.hno-heilkunde 1991 )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( verh.bern.dt.geld.hno-heilkunde 1991 ) or ((( vers.been.dt.geld.hno-heilkunde 1991 ) OR ( very.been.dt.geld.hno-heilkunde 1991 ))))".
• Adding a wildcard symbol may retrieve word variants: (( verh.bern.dt.geld.hno-heilkunde 1991 ) or ((( vers.been.dt.geld.hno-heilkunde 1991 ) OR ( very.been.dt.geld.hno-heilkunde 1991 ))))*.