Perhaps you should try some spelling variations:
passiv » passive, passiver
passiven » passiveen, passiveren, passive, passion
passivieren » passiveieren, 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 passiven) OR massiv) OR (passivieren OR (massiveeren OR massigen))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiv OR passiven) or massiv) or (passivieren or (massiveeren or massigen)))".
• Adding a wildcard symbol may retrieve word variants: (((passiv OR passiven) or massiv) or (passivieren or (massiveeren or massigen)))*.