Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivene » passiveene, massivene, passivenene, passiven, passiveand, passiverer
passiverwerb » passiveerwerb, massiverwerb, passivenerwerb, passiverer, passivewerb, passivenwerb, passivelywerb
passiver » passiveer, massiver, passivener, passive, passiven, passively
passivity » passiveity, massivity, passivenity

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 (passivene OR ((passiverwerb OR passiver) OR passivity))).
• Adding a wildcard symbol may retrieve word variants: (passiv or (passivene or ((passiverwerb or passiver) or passivity)))*.