Perhaps you should try some spelling variations:
"informationen aktuelle" » "informationen visuelle", "annotationen aktuelle", "informatik aktuelle"
"information variables" » "information tables", "interaction variables", "induction variables"
"information visible" » "information visual", "information visibility", "information vii"

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