Perhaps you should try some spelling variations:
"texts zur popularen musik" » "texts zur populare musik", "texts der popularen musik", "texts des popularen musik", "texte zu popularen musik", "text zum popularen musik", "text zu popularen musik"
"texte zur popularen musik" » "texte zur populare musik", "texte der popularen musik", "texte des popularen musik", "texte zu popularen musik"
"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 popularen musik") or ("texte zur popularen musik"))) or ("texts war popular music"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("texts zur popularen musik") OR ("texte zur popularen musik"))) OR ("texts war popular music")).
• Removing quotes may allow a broader search: (((( texts zur popularen musik ) or ( texte zur popularen musik ))) or ( texts war popular music )).
• Adding a wildcard symbol may retrieve word variants: (((("texts zur popularen musik") or ("texte zur popularen musik"))) or ("texts war popular music"))*.