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