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

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