Perhaps you should try some spelling variations:
"series estudios peruanos." » "series estudios urbanos.", "series estudios americanos.", "series estudios ensayos.", "seis estudios peruanos.", "tres estudios peruanos.", "leyes estudios peruanos."
"serie estudios hispanos." » "serie estudios hispano.", "serie estudios hispanicos.", "serie estudios espanoles."
"series estudios urbano." » "seis estudios urbano.", "tres estudios urbano.", "leyes estudios urbano.", "series estudios urbanos.", "series estudio urbano.", "series estudios hispano."

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("serie estudios hispanos.") or ((("series estudios urbano.") OR ("series estudios peruanos."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("serie estudios hispanos.") OR ((("series estudios urbano.") OR ("series estudios peruanos.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"serie estudios hispanos.\") or (((\"series estudios urbano.\") OR (\"series estudios peruanos.\"))))".
• Removing quotes may allow a broader search: (( serie estudios hispanos. ) or ((( series estudios urbano. ) OR ( series estudios peruanos. )))).
• Adding a wildcard symbol may retrieve word variants: (("serie estudios hispanos.") or ((("series estudios urbano.") OR ("series estudios peruanos."))))*.