Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passiveren » passiveeren, passiveneren, passivereren, passiverer, passiven, passiver
passivieren » passiveieren, passivenieren, passiverieren, passivierende, passivierung, passagieren
massiv » massive
massiveeren » massiveeeren, massivere, massivdecken, massivteilen
passieren » passiert, passiven
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 passieren) OR passivieren) OR (massigeren OR massiveeren))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or massiv) or (((passiveren OR passieren) or passivieren) or (massigeren or massiveeren)))".
• Adding a wildcard symbol may retrieve word variants: ((passiv or massiv) or (((passiveren OR passieren) or passivieren) or (massigeren or massiveeren)))*.