Perhaps you should try some spelling variations:
"viewed studium; grundkurs mathematik" » "viewed studium; bruckenkurs mathematik", "viewed studium; vorkurs mathematik"
"reviewed studies; grundkurs mathematik" » "reviewed studies; bruckenkurs mathematik", "reviewed studies; vorkurs mathematik", "review studies; grundkurs mathematik", "related studies; grundkurs mathematik", "resolved studies; grundkurs mathematik"

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: (("vieweg studium; grundkurs informatik") OR ((("viewed studium; grundkurs mathematik") OR ("reviewed studies; grundkurs mathematik")))).
• Removing quotes may allow a broader search: (( vieweg studium; grundkurs informatik ) or ((( viewed studium; grundkurs mathematik ) or ( reviewed studies; grundkurs mathematik )))).
• Adding a wildcard symbol may retrieve word variants: (("vieweg studium; grundkurs informatik") or ((("viewed studium; grundkurs mathematik") or ("reviewed studies; grundkurs mathematik"))))*.