Perhaps you should try some spelling variations:
"serie estudios americanos." » "serie estudios latinoamericanos."
"series estudios urbanos." » "seis estudios urbanos.", "tres estudios urbanos.", "leyes estudios urbanos.", "series estudio urbanos.", "series estudios peruanoss.", "series estudios hispanos."
"series estudios urbano." » "seis estudios urbano.", "tres estudios urbano.", "leyes estudios urbano.", "series estudio urbano.", "series estudios peruanos.", "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: (("series estudios urbanos.") or ((("series estudios urbano.") or ("serie estudios americanos."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("series estudios urbanos.") OR ((("series estudios urbano.") OR ("serie estudios americanos.")))).
• Removing quotes may allow a broader search: (( series estudios urbanos. ) or ((( series estudios urbano. ) or ( serie estudios americanos. )))).
• Adding a wildcard symbol may retrieve word variants: (("series estudios urbanos.") or ((("series estudios urbano.") or ("serie estudios americanos."))))*.