Perhaps you should try some spelling variations:
"information modell" » "information modelle", "information model", "information models"
"informatik modell" » "informatic models", "information modelle", "information models"
"geoinformatik modelle" » "geoinformatic modelse", "geoinformation modellee", "geoinformation modelse"
"informative model" » "informative models", "information model", "normative model"
"informatic model" » "informatic models", "information 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: (((("informatik modell") OR ("information modell"))) OR ((((("informatic model") OR ("informative model"))) OR ("geoinformatik modelle")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"informatik modell\") or (\"information modell\"))) or (((((\"informatic model\") OR (\"informative model\"))) or (\"geoinformatik modelle\"))))".
• Removing quotes may allow a broader search: (((( informatik modell ) or ( information modell ))) or ((((( informatic model ) OR ( informative model ))) or ( geoinformatik modelle )))).
• Adding a wildcard symbol may retrieve word variants: (((("informatik modell") or ("information modell"))) or ((((("informatic model") OR ("informative model"))) or ("geoinformatik modelle"))))*.