Perhaps you should try some spelling variations:
"beitrage 2012 popularmusikforschung" » "beitrage 2012 volksmusikforschung", "beitrage 10.2 popularmusikforschung", "beitrage 2.1 popularmusikforschung", "beitrage 3.1.2 popularmusikforschung"
"beitrage 3.7.6 popularmusikforschung" » "beitrage 3.1.2 popularmusikforschung", "beitrage 3.2 popularmusikforschung", "beitrage 3.4 popularmusikforschung"

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: (("beitrage 2012 popularmusikforschung") OR ("beitrage 3.7.6 popularmusikforschung")).
• Removing quotes may allow a broader search: (( beitrage 2012 popularmusikforschung ) or ( beitrage 3.7.6 popularmusikforschung )).
• Adding a wildcard symbol may retrieve word variants: (("beitrage 2012 popularmusikforschung") or ("beitrage 3.7.6 popularmusikforschung"))*.