Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passiveren » passiveeren, passiveneren, passivereren, passieren, passiven, passiver
passiverer » passiveerer, passivenerer, passivererer, passiverwerb, passiver, passieren
passiveieren » passiveeieren, passiveneieren, passivereieren, passionierten, passivierende, passieren
passivieren » passiveieren, passivenieren, passiverieren, 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 (((passiveren OR passiverer) 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 (((passiveren or passiverer) or (passiveieren OR passivieren)) or (massigen or massiveeren)))".
• Adding a wildcard symbol may retrieve word variants: ((passiv or massiv) or (((passiveren or passiverer) or (passiveieren OR passivieren)) or (massigen or massiveeren)))*.