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