Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
massiv » massive
massiver » massiveer, massive, massiven, passiver
massiveeren » massiveeeren, massivere, passivieren, massigeren
passieren » passiert, passiven
massinger » massing

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