Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passivieren » passiveieren, passivenieren, passiverieren, passivierende, passivierung, passieren
passiveren » passiveeren, passiveneren, passivereren, passieren, passiverer, passiven, passiverern, passivern, massiveren
passivere » passiveere, passivenere, passiverere, passiverer, passiver, massivere
massiv » massive

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 passivieren) OR passiveren) OR massiv) OR passivere).
• Adding a wildcard symbol may retrieve word variants: ((((passiv or passivieren) or passiveren) or massiv) or passivere)*.