Perhaps you should try some spelling variations:
"informatik modelle" » "information modelle", "geoinformatik modelle", "bioinformatik modelle", "informatic modele", "informatic modelse"
"informatik modell" » "information modell", "informatic model", "informatic models"
"information model" » "information modeling"

Try widening your search to All Fields.

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: (((("informatik modell") OR ("information model"))) OR ("informatik modelle")).
• Removing quotes may allow a broader search: (((( informatik modell ) or ( information model ))) or ( informatik modelle )).
• Adding a wildcard symbol may retrieve word variants: (((("informatik modell") or ("information model"))) or ("informatik modelle"))*.