Perhaps you should try some spelling variations:
"informationen aktuelle" » "informationen visuelle", "annotationen aktuelle", "informatik aktuelle"
"informatik modelle" » "informatik modell", "information modelle", "bioinformatik modelle"
"geoinformatik modelle" » "geoinformatik modell", "geoinformation modelle", "geobioinformatik modelle"

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: (("informationen aktuelle") OR ((("informatik modelle") OR ("geoinformatik modelle")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"informationen aktuelle\") or (((\"informatik modelle\") OR (\"geoinformatik modelle\"))))".
• Removing quotes may allow a broader search: (( informationen aktuelle ) or ((( informatik modelle ) OR ( geoinformatik modelle )))).
• Adding a wildcard symbol may retrieve word variants: (("informationen aktuelle") or ((("informatik modelle") OR ("geoinformatik modelle"))))*.