Perhaps you should try some spelling variations:
passiver » passive, passiven, passively
passiveen » passiven, passivieren, passiveand
passivelyer » passively, passiverer, passiverwerb
massiv » massive
massiver » massiveer, massive, massiven, 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: ((((passiver OR passiveen) OR passivelyer) OR massiv) OR massiver).
• Adding a wildcard symbol may retrieve word variants: ((((passiver or passiveen) or passivelyer) or massiv) or massiver)*.