Perhaps you should try some spelling variations:
passiv » passive, passiver
passivereer » passiveereer, passiverereer, passiverer, passiverwerb, passivierender
passiven » passiveen, passiveren, passive, passion
massiv » massive
massiven » massiveen, massive, 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: (((passiv OR massiv) OR passivereer) OR ((massiven OR passiven) OR massiveen)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiv or massiv) or passivereer) or ((massiven OR passiven) or massiveen))".
• Adding a wildcard symbol may retrieve word variants: (((passiv or massiv) or passivereer) or ((massiven OR passiven) or massiveen))*.