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