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

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