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

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: (((("series estudios peruanoss.") OR ("seis estudios peruanoss."))) or ("series estudios urbano."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("series estudios peruanoss.") OR ("seis estudios peruanoss."))) OR ("series estudios urbano.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"series estudios peruanoss.\") OR (\"seis estudios peruanoss.\"))) or (\"series estudios urbano.\"))".
• Removing quotes may allow a broader search: (((( series estudios peruanoss. ) OR ( seis estudios peruanoss. ))) or ( series estudios urbano. )).
• Adding a wildcard symbol may retrieve word variants: (((("series estudios peruanoss.") OR ("seis estudios peruanoss."))) or ("series estudios urbano."))*.