Perhaps you should try some spelling variations:
massiv » massive
massiven » massiveen, massive, massively
passiverer » passiverwerb, passiver, passieren
passivieren » passivierende, passivierung, passieren
kassierers » kassierer, kassiererin, kassieren
passiven » passive, passion

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