Perhaps you should try some spelling variations:
"informatik modelle" » "information modelle", "geoinformatik modelle", "bioinformatik modelle", "informatic modelse", "information modellee"
"informatik modell" » "information modell", "informatic models", "information modelle"
"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: "((\"informatic model\") OR (((\"informatik modelle\") OR (\"informatik modell\"))))".
• Removing quotes may allow a broader search: (( informatic model ) OR ((( informatik modelle ) OR ( informatik modell )))).
• Adding a wildcard symbol may retrieve word variants: (("informatic model") OR ((("informatik modelle") OR ("informatik modell"))))*.