Perhaps you should try some spelling variations:
heilkunde 15.15 » heilkunde 5.1, heilkunde 11
heilkunde 1991 » heilkunde 11, heilkunde 1, heilkunde 10
\"verh.bern.dt.gels.hno- » \"ver.bern.dt.gels.hno-, \"vers.bern.dt.gels.hno-, \"verb.bern.dt.gels.hno-, \"verh.been.dt.gels.hno-, \"verh.ben.dt.gels.hno-, \"verh.bern.dt.gets.hno-, \"verh.bern.dt.geld.hno-
\"verh.born.dt.gels.hno-heilkunde » \"ver.born.dt.gels.hno-heilkunde, \"vers.born.dt.gels.hno-heilkunde, \"verb.born.dt.gels.hno-heilkunde, \"verh.born.dt.gets.hno-heilkunde, \"verh.born.dt.geld.hno-heilkunde
\"verh.born.dt.gel.hno-heilkunde » \"ver.born.dt.gel.hno-heilkunde, \"vers.born.dt.gel.hno-heilkunde, \"verb.born.dt.gel.hno-heilkunde
\"very.born.dt.gels.hno-heilkunde » \"very.born.dt.gets.hno-heilkunde, \"very.born.dt.geld.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.gels.hno-((heilkunde 1991) OR (heilkunde 15.15))\") or (((\"verh.born.dt.gels.hno-heilkunde OR \"verh.born.dt.gel.hno-heilkunde) or \"very.born.dt.gels.hno-heilkunde) 1991\"))".
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((\\"verh.bern.dt.gels.hno-((heilkunde 1991) or (heilkunde 15.15))\\") or (((\\"verh.born.dt.gels.hno-heilkunde OR \\"verh.born.dt.gel.hno-heilkunde) or \\"very.born.dt.gels.hno-heilkunde) 1991\\"))\"".
• Removing quotes may allow a broader search: (( verh.bern.dt.gels.hno-((heilkunde 1991) or (heilkunde 15.15)) ) or ((( verh.born.dt.gels.hno-heilkunde OR verh.born.dt.gel.hno-heilkunde) or very.born.dt.gels.hno-heilkunde) 1991 )).