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

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