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

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