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 urbanos." » "serie estudios urbanos.", "serie estudios urbano.", "serie studia urbanos.", "serie estudio urbanos."
"serie guias urbanos." » "serie parias urbanos.", "serie ruinas urbanas.", "serie buses urbanos."

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: (((("serie studias urbanos.") or ("serie guias urbanos."))) or ("series estudios peruanos."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("serie studias urbanos.") OR ("serie guias urbanos."))) OR ("series estudios peruanos.")).
• Removing quotes may allow a broader search: (((( serie studias urbanos. ) or ( serie guias urbanos. ))) or ( series estudios peruanos. )).
• Adding a wildcard symbol may retrieve word variants: (((("serie studias urbanos.") or ("serie guias urbanos."))) or ("series estudios peruanos."))*.