Perhaps you should try some spelling variations:
"serie estudios peruanoss." » "serie estudios peruanos."
"serie estudios urbanos." » "serie estudio urbanos.", "serie estudios peruanoss.", "serie estudios hispanos."
"tres estudios urbano." » "tres estudio urbano.", "tres estudios peruanos.", "tres estudios hispano.", "otros estudios urbano.", "los estudios urbano.", "dos estudios 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 estudios urbanos.") OR ("serie estudios peruanoss."))) or ("tres estudios urbano."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("serie estudios urbanos.") OR ("serie estudios peruanoss."))) OR ("tres estudios urbano."))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"serie estudios urbanos.\") OR (\"serie estudios peruanoss.\"))) or (\"tres estudios urbano.\"))*".
• Removing quotes may allow a broader search: (((( serie estudios urbanos. ) OR ( serie estudios peruanoss. ))) or ( tres estudios urbano. ))*.