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