Perhaps you should try some spelling variations:
"los estudios urbano." » "los estudios urbanos.", "los estudios peruanos.", "los estudios hispano."
"series estudio urbano." » "series estudios urbano.", "serie estudios urbano.", "senales estudio urbano.", "series estudios urbanos.", "series espacio urbano."
"serie estudio urbano." » "serie estudios urbanos.", "serie espacio urbano.", "serie estudios urbano.", "series estudios urbano.", "serie studia urbano."

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: (((("series estudio urbano.") OR ("serie estudio urbano."))) or ("los estudios urbano."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("series estudio urbano.") OR ("serie estudio urbano."))) OR ("los estudios urbano.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"series estudio urbano.\") OR (\"serie estudio urbano.\"))) or (\"los estudios urbano.\"))".
• Removing quotes may allow a broader search: (((( series estudio urbano. ) OR ( serie estudio urbano. ))) or ( los estudios urbano. )).
• Adding a wildcard symbol may retrieve word variants: (((("series estudio urbano.") OR ("serie estudio urbano."))) or ("los estudios urbano."))*.