Perhaps you should try some spelling variations:
"dios estudios peruanos." » "dios estudios urbanos.", "dios estudios americanos.", "dios estudios ensayos.", "dos estudios peruanos.", "los estudios peruanos.", "otros estudios peruanos."
"series estudios hispano." » "serie estudios hispano.", "seis estudios hispano.", "leyes estudios hispano."
"tres estudios hispano." » "otros estudios hispano.", "los estudios hispano.", "dos 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: (((("series estudios hispano.") OR ("tres estudios hispano."))) or ("dios estudios peruanos."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("series estudios hispano.") OR ("tres estudios hispano."))) OR ("dios estudios peruanos."))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"series estudios hispano.\") OR (\"tres estudios hispano.\"))) or (\"dios estudios peruanos.\"))*".
• Removing quotes may allow a broader search: (((( series estudios hispano. ) OR ( tres estudios hispano. ))) or ( dios estudios peruanos. ))*.