Perhaps you should try some spelling variations:
"series estudioss urbano." » "serie estudios urbano.", "seis estudios urbano.", "serie estudio urbano.", "series estudios urbanos.", "series estudio urbano.", "serie estudioss urbano.", "seis estudioss urbano.", "leyes estudioss urbano."
"series estudios urbano." » "serie estudios urbano.", "seis estudios urbano.", "leyes estudios urbano.", "series estudios urbanos.", "series estudio urbano.", "series estudios peruanos."
"tres estudios urbano." » "tres estudios urbanos.", "tres estudio urbano.", "tres estudios peruanos.", "otros estudios urbano.", "los estudios urbano.", "dos estudios urbano."

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