Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passiven » passiveen, massiven, passiveren, passive, passion
passiveeren » passiveeeren, massiveeren, passivereeren, passivieren, passieren, passiverer
passiveeeren » passiveeeeren, massiveeeren, passivereeeren, passivieren, passieren, passiverer
massigeren » massiger, massivere, massierer
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 ((massigeren OR massigen) OR (passiveeren OR passiveeeren)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(passiv or (passiven or ((massigeren OR massigen) or (passiveeren or passiveeeren))))".
• Adding a wildcard symbol may retrieve word variants: (passiv or (passiven or ((massigeren OR massigen) or (passiveeren or passiveeeren))))*.