Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passiven » passiveen, massiven, passiveren, passive, passion
passiveeren » passiveeeren, massiveeren, passivereeren, passivieren, passiverer, passivierende
passiverwerb » passiveerwerb, massiverwerb, passivererwerb, passiverer
massively » massive
passieren » passiert

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 (massively OR ((passiveeren OR passieren) OR passiverwerb))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or passiven) or (massively or ((passiveeren OR passieren) or passiverwerb)))".
• Adding a wildcard symbol may retrieve word variants: ((passiv or passiven) or (massively or ((passiveeren OR passieren) or passiverwerb)))*.