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