Perhaps you should try some spelling variations:
"series estudioss peruanoss." » "series estudios peruanos.", "series estudios peruanoss.", "seis estudios peruanoss.", "serie estudio peruanoss."
"dos estudios hispanos." » "dos estudios hispano.", "dos estudios hispanicos.", "dos estudios espanoles.", "los estudios hispanos."
"serie estudios urbano." » "serie estudios urbanos.", "serie estudio urbano.", "serie 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: (((("series estudioss peruanoss.") or ("serie estudios urbano."))) or ("dos estudios hispanos."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("series estudioss peruanoss.") OR ("serie estudios urbano."))) OR ("dos estudios hispanos.")).
• Removing quotes may allow a broader search: (((( series estudioss peruanoss. ) or ( serie estudios urbano. ))) or ( dos estudios hispanos. )).
• Adding a wildcard symbol may retrieve word variants: (((("series estudioss peruanoss.") or ("serie estudios urbano."))) or ("dos estudios hispanos."))*.