Perhaps you should try some spelling variations:
"tres estudioss urbano." » "tres estudio urbano.", "tres estadios urbano.", "otros estudios urbano.", "tres estados urbano.", "otros estudioss urbano.", "los estudioss urbano.", "dos estudioss urbano."
"tres estudios urbano." » "tres estudio urbano.", "tres estudios peruanos.", "tres estudios hispano.", "otros estudios urbano.", "los estudios urbano.", "dos estudios urbano."
"serie estudios urbanos." » "serie estudio urbanos.", "serie estudios peruanoss.", "serie estudios hispanos."

Try widening your search to All Fields.

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

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