Perhaps you should try some spelling variations:
"dios estudios americanos." » "dios estudios latinoamericanos.", "dos estudios americanos.", "los estudios americanos.", "otros estudios americanos."
"series estudios urbano." » "serie estudios urbano.", "seis estudios urbano.", "tres estudios urbano.", "series estudios urbanos.", "series estudio urbano.", "series estudios peruanos."
"serie estudos urbano." » "serie estudios urbanos.", "serie estudio urbano.", "serie d'estudis urbans.", "serie estudios urbano.", "serie estado urbano."

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

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