Perhaps you should try some spelling variations:
"vieweg studium; grundkurs mathematik" » "vieweg studium; bruckenkurs mathematik", "vieweg studium; grundkurs informatik"
"viewed studium; grundkurs mathematik" » "viewed studium; bruckenkurs mathematik", "viewed studium; grundkurs informatik"
"reviewed studies; grundkurs mathematik" » "reviewed studies; bruckenkurs mathematik", "reviewed studies; grundkurs informatik", "review studies; grundkurs mathematik", "related studies; grundkurs mathematik", "repeated studies; grundkurs mathematik"
"resolved studies; grundkurs mathematik" » "resolved studies; bruckenkurs 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; grundkurs mathematik") OR ((((("viewed studium; grundkurs mathematik") OR ("viewed studium; vorkurs mathematik"))) OR ((("reviewed studies; grundkurs mathematik") OR ("resolved studies; grundkurs mathematik")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"vieweg studium; grundkurs mathematik\") or (((((\"viewed studium; grundkurs mathematik\") OR (\"viewed studium; vorkurs mathematik\"))) or (((\"reviewed studies; grundkurs mathematik\") or (\"resolved studies; grundkurs mathematik\"))))))".
• Removing quotes may allow a broader search: (( vieweg studium; grundkurs mathematik ) or ((((( viewed studium; grundkurs mathematik ) OR ( viewed studium; vorkurs mathematik ))) or ((( reviewed studies; grundkurs mathematik ) or ( resolved studies; grundkurs mathematik )))))).
• Adding a wildcard symbol may retrieve word variants: (("vieweg studium; grundkurs mathematik") or ((((("viewed studium; grundkurs mathematik") OR ("viewed studium; vorkurs mathematik"))) or ((("reviewed studies; grundkurs mathematik") or ("resolved studies; grundkurs mathematik"))))))*.