Perhaps you should try some spelling variations:
"series estudios urbano." » "serie estudios urbano.", "seis estudios urbano.", "tres estudios urbano.", "series estudios urbanos.", "series estudio urbano.", "series estudios peruanos."
"serie estudio urbanos." » "serie estudios urbanos.", "serie estudio urbano.", "serie estudios peruanos.", "serie studia urbanos.", "serie estado urbanos."
"serie studias urbano." » "serie estudios urbanos.", "serie estudio urbano.", "serie studia urbano.", "serie estudios urbano.", "serie guias urbano."

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

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