Perhaps you should try some spelling variations:
"serie estudios peruanos." » "serie estudios urbanos.", "serie estudios americanos.", "serie estudios ensayos."
"serie estudos cubano." » "serie estudios urbano.", "serie estudios urbanos.", "series estudios cubano.", "serie estudio cubano.", "serie studia cubano."
"serie estado cubano." » "serie estudio cubano.", "serret estado cubano.", "serie ecuador cubano."

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

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