Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passively » passiveely, massively, passivenely, passive, passivity
passiveneer » passiveeneer, massiveneer, passiveneneer, passiverer, passiverwerb
massivieren » passivieren, massivere, massigeren
massiven » massive, passiven, 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 passively) OR (massivieren OR massiven)) OR passiveneer).
• Adding a wildcard symbol may retrieve word variants: (((passiv or passively) or (massivieren or massiven)) or passiveneer)*.