Perhaps you should try some spelling variations:
passiver » passive, passiven, passively
passivereer » passiveeer, passiveneer, passivelyeer, passiverer, passiverwerb, passivierender
massiv » massive
massiven » massiveen, massive, passiven, massively
massiveen » massiveeen, massivement, massivsten, massigeren

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: (((passiver OR massiv) OR passivereer) OR (massiven OR massiveen)).
• Adding a wildcard symbol may retrieve word variants: (((passiver or massiv) or passivereer) or (massiven or massiveen))*.