Perhaps you should try some spelling variations:
"informatik modelle" » "informatik modell", "information modelle", "geoinformatik modelle"
"information model" » "information modeling"
"informative model" » "informative models", "normative model", "information models"

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