Perhaps you should try some spelling variations:
passiv » passive, passiven
passiver » passiveer, passivener, passive, passiven, passively
passiverer » passiveerer, passivenerer, passiveer, passivener, passivelyer, passieren, passagerer, massivere
passiverwerb » passiveerwerb, passivenerwerb, passivewerb, passivenwerb, passivelywerb
passiveieren » passiveeieren, passiveneieren, passionierten, passivierende, passieren
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 passiverwerb)) OR (passiveieren 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 passiverwerb)) or (passiveieren or passivieren)) or (massigen or massiveeren)))".
• Adding a wildcard symbol may retrieve word variants: ((passiv or massiv) or (((passiver or (passiverer OR passiverwerb)) or (passiveieren or passivieren)) or (massigen or massiveeren)))*.