Perhaps you should try some spelling variations:
passiver » passive, passiven, passively
passiverwerb » passivewerb, passivenwerb, passivelywerb
passiverer » passiveer, passivener, passivelyer, passivieren, passieren, massivere
massiv » massive
passiveen » passiven, passivieren, passiveand
passagerer » passagere, passageren, passagieren

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: (((passiver OR massiv) OR passiveen) OR (passiverwerb OR (passiverer OR passagerer))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiver or massiv) or passiveen) or (passiverwerb or (passiverer OR passagerer)))".
• Adding a wildcard symbol may retrieve word variants: (((passiver or massiv) or passiveen) or (passiverwerb or (passiverer OR passagerer)))*.