Perhaps you should try some spelling variations:
"dos estudios peruanoss." » "dos estudios peruanos.", "los estudios peruanoss."
"series estudios hispanos." » "series estudios hispano.", "series estudios hispanicos.", "series estudios espanoles.", "serie estudios hispanos.", "seis estudios hispanos.", "tres estudios hispanos."
"artes estudios urbanos." » "partes estudios urbanos.", "arte estudios urbanos.", "artes estudio urbanos."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("dos estudios peruanoss.") or ("artes estudios urbanos."))) or ("series estudios hispanos."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dos estudios peruanoss.") OR ("artes estudios urbanos."))) OR ("series estudios hispanos."))*.
• Removing quotes may allow a broader search: (((( dos estudios peruanoss. ) or ( artes estudios urbanos. ))) or ( series estudios hispanos. ))*.