Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passiveen » passiveeen, massiveen, passiveneen, passiven, passivieren, passiveand
passiveeren » passiveeeren, massiveeren, passiveneeren, passivieren, passieren, passiverer
passiverwerb » passiveerwerb, massiverwerb, passivenerwerb, passiverer
massiven » massive, passiven, massiv
massively » 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 (massiven OR passiveen)) OR (massively OR (passiveeren OR passiverwerb))).
• Adding a wildcard symbol may retrieve word variants: ((passiv or (massiven or passiveen)) or (massively or (passiveeren or passiverwerb)))*.