Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passiveerwerb » passiveeerwerb, massiveerwerb, passiveneerwerb, passiverwerb
passiverer » passiveerer, massiverer, passivenerer, passiverwerb, passivieren, passiver
massiveren » massivere, massigeren, massivement

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: ((passiv OR massiveren) OR (passiveerwerb OR passiverer))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or massiveren) or (passiveerwerb OR passiverer))*".