Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passivereren » passiveereren, passivenereren, passiverereren, passivieren, passivierenden, passieren, passiverwerben, passivierenen, passiveren
passiverer » passiveerer, passivenerer, passivererer, passiverwerb, passivieren, passiver
passiveieren » passiveeieren, passiveneieren, passivereieren, passivieren, passionierten, passivierende
massiv » massive
massiveeren » massiveeeren, massivere, passivieren, massigeren
massigen » massiger, massigung, massig, massigern, massign
massie » massive, massif, massiven
massige » massiger, massig

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 (((passivereren OR passiverer) OR passiveieren) OR (((massigen OR massie) OR massige) OR massiveeren))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or massiv) or (((passivereren or passiverer) or passiveieren) or (((massigen OR massie) or massige) or massiveeren)))".
• Adding a wildcard symbol may retrieve word variants: ((passiv or massiv) or (((passivereren or passiverer) or passiveieren) or (((massigen OR massie) or massige) or massiveeren)))*.