Perhaps you should try some spelling variations:
"serie estudio urbanos." » "serie estudio urbano.", "serie estudios urbano.", "serie estudios peruanos.", "serie estudios urbanos.", "serie estado urbanos.", "serie estudos urbanos."
"series estudios urbanos." » "serie estudios urbanos.", "seis estudios urbanos.", "tres estudios urbanos."
"serie studia urbano." » "serie estudio urbano.", "serie estudios 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 ("series estudios urbanos."))) OR ("serie studia urbano."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"serie estudio urbanos.\") OR (\"series estudios urbanos.\"))) or (\"serie studia urbano.\"))~".
• Removing quotes may allow a broader search: (((( serie estudio urbanos. ) OR ( series estudios urbanos. ))) or ( serie studia urbano. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("serie estudio urbanos.") OR ("series estudios urbanos."))) or ("serie studia urbano."))*.