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

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