Perhaps you should try some spelling variations:
"series estudios cervantinos." » "series estudios mercantiles.", "series estudios criticos.", "series estudios andinos.", "serie estudios cervantinos.", "tres estudios cervantinos.", "leyes estudios cervantinos."
"serie studia urbanos." » "serie estudio urbano.", "serie estudios urbanos."
"seis estudios urbanos." » "los estudios urbanos.", "dos estudios urbanos.", "dios estudios urbanos."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("serie studia urbanos.") or ("seis estudios urbanos."))) or ("series estudios cervantinos."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("serie studia urbanos.") OR ("seis estudios urbanos."))) OR ("series estudios cervantinos."))*.
• Removing quotes may allow a broader search: (((( serie studia urbanos. ) or ( seis estudios urbanos. ))) or ( series estudios cervantinos. ))*.