Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passiveren » passiveeren, massiveren, passiveneren, passivieren, passieren, passiverer
passiveeren » passiveeeren, massiveeren, passiveneeren, passivieren, passieren, passiverer
passiveeeren » passiveeeeren, massiveeeren, passiveneeeren, passivieren, passieren, passiverer
passiveneeeren » passiveeneeeren, massiveneeeren, passiveneneeeren
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 (passiveren OR (massigeren OR (passiveeren OR (passiveeeren OR passiveneeeren))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(passiv or (passiveren or (massigeren or (passiveeren or (passiveeeren OR passiveneeeren)))))".
• Adding a wildcard symbol may retrieve word variants: (passiv or (passiveren or (massigeren or (passiveeren or (passiveeeren OR passiveneeeren)))))*.