Perhaps you should try some spelling variations:
"serie estudios urbano." » "serie estudios urbanos.", "serie estudio urbano.", "serie estudios peruanos.", "series estudioss urbano.", "serie studias urbano.", "serie estudoss urbano."
"serie estudio cubano." » "serie estudio urbano.", "serie estudio caso.", "serie estudiante cubano.", "series estudios cubano.", "serie studia cubano.", "serie estudos cubano."
"serie estado cubano." » "serie estudos cubano.", "serret estado cubano.", "serie ecuador cubano."

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