Perhaps you should try some spelling variations:
passiv » passive, passiver
passiven » passiveen, passiveren, passive, passion
passiverer » passiveerer, passivererer, passiverwerb, passivieren, passiver
passivereen » passiveereen, passiverereen, passieren, passivieren, passivierenden
passiveeren » passiveeeren, passivereeren, passivieren, passieren, passivierende
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 massiv) OR ((passiven OR (passiverer OR passivereen)) OR passiveeren)).
• Adding a wildcard symbol may retrieve word variants: ((passiv or massiv) or ((passiven or (passiverer or passivereen)) or passiveeren))*.