Perhaps you should try some spelling variations:
"dios estudios peruanos." » "dios estudios urbanos.", "dios estudios americanos.", "dios estudios ensayos.", "dos estudios peruanos.", "los estudios peruanos.", "otros estudios peruanos."
"series estudios urbano." » "seis estudios urbano.", "tres estudios urbano.", "leyes estudios urbano.", "series estudios urbanos.", "series estudio urbano.", "series estudios hispano."
"serie estudios urbano." » "serie estudios urbanos.", "serie estudio urbano.", "serie estudios hispano."

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

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