Perhaps you should try some spelling variations:
heilkunde 15.15 » heilkunde 5.1, heilkunde 11
heilkunde 1991 » heilkunde 11, heilkunde 16, heilkunde 18
heilkunde 10 » heilkunde 11, heilkunde 16, heilkunde 18
heilkunde 1 » heilkunde 11, heilkunde 16, heilkunde 18
verh.bern.dt.geld.hno- » very.bern.dt.geld.hno-, ver.bern.dt.geld.hno-, verb.bern.dt.geld.hno-, verh.ben.dt.geld.hno-, verh.bern.dt.gold.hno-
vers.born.dt.gel.hno-heilkunde » verse.born.dt.gel.hno-heilkunde, verso.born.dt.gel.hno-heilkunde, very.born.dt.gel.hno-heilkunde
vers.been.dt.gel.hno-heilkunde » verse.been.dt.gel.hno-heilkunde, verso.been.dt.gel.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 (heilkunde 1)) ) OR ((( vers.born.dt.gel.hno-heilkunde 10 ) OR ( vers.been.dt.gel.hno-heilkunde 15.15 )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( verh.bern.dt.geld.hno-((heilkunde 1991) OR (heilkunde 1)) ) or ((( vers.born.dt.gel.hno-heilkunde 10 ) or ( vers.been.dt.gel.hno-heilkunde 15.15 ))))".
• Adding a wildcard symbol may retrieve word variants: (( verh.bern.dt.geld.hno-((heilkunde 1991) OR (heilkunde 1)) ) or ((( vers.born.dt.gel.hno-heilkunde 10 ) or ( vers.been.dt.gel.hno-heilkunde 15.15 ))))*.