Perhaps you should try some spelling variations:
"reales estudios urbanos." » "reales estudio urbanos.", "rurales estudios urbanos.", "locales estudios urbanos.", "reales estudios peruanoss.", "reales estudios hispanos.", "reales d'estudis urbanss."
"serie estudios urbano." » "serie estudios peruanos.", "serie estudios hispano.", "serie d'estudis urbans."
"series estudio urbano." » "series estudios urbano.", "serie estudio urbano.", "senales estudio urbano.", "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: (("reales estudios urbanos.") or ((("series estudio urbano.") OR ("serie estudios urbano."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("reales estudios urbanos.") OR ((("series estudio urbano.") OR ("serie estudios urbano."))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"reales estudios urbanos.\") or (((\"series estudio urbano.\") OR (\"serie estudios urbano.\"))))*".
• Removing quotes may allow a broader search: (( reales estudios urbanos. ) or ((( series estudio urbano. ) OR ( serie estudios urbano. ))))*.