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