Perhaps you should try some spelling variations:
passiv » passive, passiven
passiver » passiveer, passivener, passive, passiven, passively
passiverer » passiveerer, passivenerer, passiveer, passivener, passivelyer, passiverwerb, passieren, passagerer
passiveieren » passiveeieren, passiveneieren, passionierten, passivierende, passieren
passiveeieren » passiveeeieren, passiveneeieren
passivieren » passiveieren, passivenieren, passivierende, passivierung, passieren
massiv » massive
massiveeren » massiveeeren, massivere, massigeren, massivdecken
massigen » massiger, massige, massigung

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