Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passiverer » passiveerer, passivenerer, passivererer, passiverwerb, passivieren, passiver
massiv » massive
massiveren » massiveeren, massivere, massigeren, massivement
massiveeren » massiveeeren, massivere, passivieren, massigeren

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 massiv) OR (passiverer OR (massiveren OR massiveeren))).
• Adding a wildcard symbol may retrieve word variants: ((passiv or massiv) or (passiverer or (massiveren or massiveeren)))*.