Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passiveren » passiveeren, passiveneren, passivereren, passivieren, passieren, passiven
passiverer » passiveerer, passivenerer, passivererer, passiverwerb, passivieren, passiver
massiv » massive
massiveeren » massiveeeren, massivere, passivieren, massivdecken
massigeren » massiger, massigen, massivere

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 (massigeren OR massiveeren))).
• Adding a wildcard symbol may retrieve word variants: ((passiv or massiv) or ((passiveren or passiverer) or (massigeren or massiveeren)))*.