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

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 ("partes estudios urbano."))) or ("series estudios hispanos."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dos estudios peruanoss.") OR ("partes estudios urbano."))) OR ("series estudios hispanos."))*.
• Removing quotes may allow a broader search: (((( dos estudios peruanoss. ) or ( partes estudios urbano. ))) or ( series estudios hispanos. ))*.