Perhaps you should try some spelling variations:
heilkunde 15.15 » heilkunde 5.1, heilkunde 11
heilkunde 10 » heilkunde 1, heilkunde 11, heilkunde 16
verh.born.dt.gel.hno- » very.born.dt.gel.hno-, vers.born.dt.gel.hno-, verb.born.dt.gel.hno-, veryh.born.dt.gel.hno-, everh.born.dt.gel.hno-, vierh.born.dt.gel.hno-
ver.born.dt.gel.hno- » very.born.dt.gel.hno-, ever.born.dt.gel.hno-, vier.born.dt.gel.hno-

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.born.dt.gel.hno- OR ver.born.dt.gel.hno-)((heilkunde 15.15) OR (heilkunde 10)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(verh.born.dt.gel.hno- OR ver.born.dt.gel.hno-)((heilkunde 15.15) or (heilkunde 10))".
• Adding a wildcard symbol may retrieve word variants: (verh.born.dt.gel.hno- OR ver.born.dt.gel.hno-)((heilkunde 15.15) or (heilkunde 10))*.