Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passiveen » passiveeen, massiveen, passiveneen, passiven, passiveand, passiverer
passiveeren » passiveeeren, massiveeren, passiveneeren, passieren, passiverer, passivierende
passiveerer » passiveeerer, massiveerer, passiveneerer, passiverer, passiverwerb
passivieren » passiveieren, massivieren, passivenieren, passivierende, passivierung, passieren
massiven » massive, passiven, massiv
massively » massive

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 (massiven OR passiveen)) OR (massively OR (passiveeren OR (passiveerer OR passivieren)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or (massiven or passiveen)) or (massively or (passiveeren or (passiveerer OR passivieren))))".
• Adding a wildcard symbol may retrieve word variants: ((passiv or (massiven or passiveen)) or (massively or (passiveeren or (passiveerer OR passivieren))))*.