Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivieren » passiveieren, massivieren, passivenieren, passivierende, passivierung, passagieren
passivere » passiveere, massivere, passivenere, passiverer, passiver, passiviert
passieren » passiert, passiven
massivere » massive, massively, massiven, massivee, massivene, passivere
massiver » massive, massiven, passiver

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 (passieren OR passivieren)) OR ((passivere OR massivere) OR massiver)).
• Adding a wildcard symbol may retrieve word variants: ((passiv or (passieren or passivieren)) or ((passivere or massivere) or massiver))*.