Perhaps you should try some spelling variations:
"texts zur popularen musik" » "texts zur populare musik", "texts der popularen musik", "texts des popularen musik", "texts more popularen musik", "texts der populareen musik", "texte zur popularen musik", "texte zu popularen musik", "text zum popularen musik"
"texts zur popular music" » "texts more popular music", "texts der populare music", "texte zur popular music", "texte zu popular music", "text zum popular music"
"texts war popular music" » "texts a popular music", "texts more popular music", "texts der populare music", "texts part popular music"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("texts zur popular music") OR ("texts war popular music"))) or ("texts zur popularen musik"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("texts zur popular music") OR ("texts war popular music"))) OR ("texts zur popularen musik")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"texts zur popular music\") OR (\"texts war popular music\"))) or (\"texts zur popularen musik\"))".
• Removing quotes may allow a broader search: (((( texts zur popular music ) OR ( texts war popular music ))) or ( texts zur popularen musik )).
• Adding a wildcard symbol may retrieve word variants: (((("texts zur popular music") OR ("texts war popular music"))) or ("texts zur popularen musik"))*.