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

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