Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passivereen » passiveereen, passivenereen, passiverereen, passieren, passivieren, passiverer
passiverwerb » passiveerwerb, passivenerwerb, passivererwerb, passiverer
massiv » 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 massiv) OR (passivereen OR passiverwerb)).
• Adding a wildcard symbol may retrieve word variants: ((passiv or massiv) or (passivereen or passiverwerb))*.