Perhaps you should try some spelling variations:
"tres estudios peruanoss." » "tres estudios peruanos.", "otros estudios peruanoss.", "los estudios peruanoss.", "dos estudios peruanoss."
"serie estudioss peruanos." » "serie estudios peruanos.", "serie estudio peruanos.", "serie estudos peruanos."
"series estudios urbanos." » "serie estudios urbanos.", "seis estudios urbanos.", "leyes estudios urbanos.", "series estudios urbano."

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