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

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"informatik modell\") OR (((\"informatic model\") OR (\"geoinformatik modelle\"))))".
• Removing quotes may allow a broader search: (( informatik modell ) OR ((( informatic model ) OR ( geoinformatik modelle )))).
• Adding a wildcard symbol may retrieve word variants: (("informatik modell") OR ((("informatic model") OR ("geoinformatik modelle"))))*.