Perhaps you should try some spelling variations:
"series estudios urbanos." » "serie estudios urbanos.", "seis estudios urbanos.", "tres estudios urbanos."
"serie estudio urbanos." » "serie estudio urbano.", "serie estudios urbano.", "serie estudios peruanos.", "serie estudios urbanos.", "serie studia urbanos.", "serie estado urbanos."
"serie studias urbano." » "serie estudios urbano.", "serie estudio urbano.", "serie studia urbano.", "serie guias 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: (("serie studias urbano.") or ((("serie estudio urbanos.") OR ("series estudios urbanos."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("serie studias urbano.") OR ((("serie estudio urbanos.") OR ("series estudios urbanos.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"serie studias urbano.\") or (((\"serie estudio urbanos.\") OR (\"series estudios urbanos.\"))))".
• Removing quotes may allow a broader search: (( serie studias urbano. ) or ((( serie estudio urbanos. ) OR ( series estudios urbanos. )))).
• Adding a wildcard symbol may retrieve word variants: (("serie studias urbano.") or ((("serie estudio urbanos.") OR ("series estudios urbanos."))))*.