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."
"parte estudios urbano." » "parte estudios urbanos.", "parte estudio urbano.", "parte estudios peruanos.", "partes estudios urbano.", "arte estudios urbano.", "arte estudio urbano."

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