Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passiveeren » passiveeeren, passiveneeren, passivereeren, passieren, passiverer, passivierende
passivieren » passiveieren, passivenieren, passiverieren, passivierende, passivierung, passieren
massiv » massive
massiveeren » massiveeeren, massivere, massivteilen
massivdecken » massivedecken, massivbrucken
massigeren » massiger, massigen, massivere

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