Perhaps you should try some spelling variations:
passiv » passiven, passiver
passive » passivene, passivere
passieren » passiert, passiven
massiv » massive
massivere » massiveere, massiver, massive, massively

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 passive) OR passieren) OR massiv) OR massivere).
• Adding a wildcard symbol may retrieve word variants: ((((passiv or passive) or passieren) or massiv) or massivere)*.