Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passiveren » passiveeren, passiveneren, passivereren, passivieren, passieren, passiverer
passiveeren » passiveeeren, passiveneeren, passivereeren, passivieren, passieren, passiverer
passiveneren » passiveeneren, passiveneneren, passivereneren, passivieren, passieren, passiverer
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 passiveeren) OR passiveneren) OR (massigeren OR massiveeren))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or massiv) or (((passiveren OR passiveeren) or passiveneren) or (massigeren or massiveeren)))".
• Adding a wildcard symbol may retrieve word variants: ((passiv or massiv) or (((passiveren OR passiveeren) or passiveneren) or (massigeren or massiveeren)))*.