Perhaps you should try some spelling variations:
"informationsmanager" » "informationsmanagement", "informationsempfanger", "informationsmanagements"
"informationsmangel" » "informationsmittel", "informationsempfanger", "informationsangebot"
"innovationsmanager" » "innovationsmanagements"

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: (((("informationsmanager" OR "informationsmangel") OR "informationstrager") OR "innovationsmanager") OR "innovationsmanagement").
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"informationsmanager\" OR \"informationsmangel\") or \"informationstrager\") or \"innovationsmanager\") or \"innovationsmanagement\")".
• Removing quotes may allow a broader search: (((( informationsmanager OR informationsmangel ) or informationstrager ) or innovationsmanager ) or innovationsmanagement ).
• Adding a wildcard symbol may retrieve word variants: (((("informationsmanager" OR "informationsmangel") or "informationstrager") or "innovationsmanager") or "innovationsmanagement")*.