Perhaps you should try some spelling variations:
"seis estudios peruanoss." » "seis estudios urbanos.", "seis estudios urbanoss.", "seis estudios americanoss.", "seis estudios ensayoss.", "dos estudios peruanoss.", "dios estudios peruanoss.", "pons estudios peruanoss."
"los estudios peruanos." » "los estudios urbanos.", "los estudios americanos.", "los estudios ensayos."
"series estudio urbano." » "series estudios urbano.", "serie estudio urbano.", "serie estudios urbano.", "series estudios urbanos.", "series espacio 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: (("series estudio urbano.") or ((("los estudios peruanos.") or ("seis estudios peruanoss."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("series estudio urbano.") OR ((("los estudios peruanos.") OR ("seis estudios peruanoss.")))).
• Removing quotes may allow a broader search: (( series estudio urbano. ) or ((( los estudios peruanos. ) or ( seis estudios peruanoss. )))).
• Adding a wildcard symbol may retrieve word variants: (("series estudio urbano.") or ((("los estudios peruanos.") or ("seis estudios peruanoss."))))*.