Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passiven » passiveen, massiven, passiveren, passive, passion
passivieren » passiveieren, massivieren, passiverieren, passivierende, passivierung, passieren
passiveeeer » passiveeeeer, massiveeeer, passivereeeer
passiverer » passiveerer, massiverer, passivererer, passiver, passieren, passagerer
passiverwerb » passiveerwerb, massiverwerb, passivererwerb

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