Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passiveeren » passiveeeren, passiveneeren, passivereeren, passivieren, passieren, passivierende
passiverer » passiveerer, passivenerer, passivererer, passiverwerb, passivieren, passiver
massiv » massive
massiveeren » massiveeeren, massivere, passivieren, massigeren
massiger » massinger, massive, massie

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