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

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 ("geoinformation modellee")))).
• Removing quotes may allow a broader search: (( informatik modell ) or ((( informatic model ) or ( geoinformation modellee )))).
• Adding a wildcard symbol may retrieve word variants: (("informatik modell") or ((("informatic model") or ("geoinformation modellee"))))*.