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

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