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