Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivere » passiveere, massivere, passivenere, passiverer, passiver
passivener » passiveener, massivener, passivenener, passiverer, passiven, passiver
massiven » massive, passiven, 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 massiven) OR ((passivere OR passivener) OR massiven)).
• Adding a wildcard symbol may retrieve word variants: ((passiv or massiven) or ((passivere or passivener) or massiven))*.