Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passiven » passiveen, massiven, passiveren, passive, passion
passivieren » passiveieren, massivieren, passiverieren, passivierende, passivierung, passieren
passiveeeren » passiveeeeren, massiveeeren, passivereeeren, passieren
passiverer » passiveerer, massiverer, passivererer, passiverwerb, passiver, passieren
massiveren » massivere, massigeren, massivement

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 (massiveren OR (passivieren OR (passiveeeren OR passiverer))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(passiv or (passiven or (massiveren or (passivieren or (passiveeeren OR passiverer)))))".
• Adding a wildcard symbol may retrieve word variants: (passiv or (passiven or (massiveren or (passivieren or (passiveeeren OR passiverer)))))*.