Perhaps you should try some spelling variations:
passiven » passive, passion
passivene » passivee, passione, passiveand, passiverer, passive
passivierende » passivierender, aktivierende, passivierung, passivierungde, passierende, passagierende
passivieren » passivierung, passieren, passagieren
massiverer » massivere, massierer, passiverer

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: (passiven OR ((passivene OR (passivierende OR passivieren)) OR massiverer)).
• Adding a wildcard symbol may retrieve word variants: (passiven or ((passivene or (passivierende or passivieren)) or massiverer))*.