Perhaps you should try some spelling variations:
passiv » passive, passiver
passiven » passiveen, passiveren, passive, passion
passiverer » passiveerer, passivererer, passiverwerb, passivieren, passiver
passivereeeren » passiveereeeren, passiverereeeren
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 ((passiven OR massiv) OR (massivere OR (passiverer OR passivereeeren)))).
• Adding a wildcard symbol may retrieve word variants: (passiv or ((passiven or massiv) or (massivere or (passiverer or passivereeeren))))*.