Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passiverer » passiveerer, passivenerer, passivererer, passiverwerb, passivieren, passiver
passiveren » passiveeren, passiveneren, passivereren, passivieren, passieren, passiven
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 passiverer) OR passiveren) OR massiv)*.