Perhaps you should try some spelling variations:
"los estudios etnicos." » "los estudios criticos.", "los estudios biblicos."
"serie estudos urbanss." » "serie estudios urbanos.", "serie estudios urbano.", "serie d'estudis urbans.", "serie estudios urbanss.", "series estudios urbanss.", "serie estado urbanss."
"series estudio urbano." » "series estudios urbano.", "serie estudio urbano.", "serie estudios urbano.", "series estudios urbanos.", "series espacio urbano."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("serie estudos urbanss.") or ((("series estudio urbano.") or ("los estudios etnicos."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("serie estudos urbanss.") OR ((("series estudio urbano.") OR ("los estudios etnicos."))))*.
• Removing quotes may allow a broader search: (( serie estudos urbanss. ) or ((( series estudio urbano. ) or ( los estudios etnicos. ))))*.