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