Perhaps you should try some spelling variations:
"dos estudios americanos." » "dos estudios latinoamericanos.", "los estudios americanos."
"seis estudios urbano." » "seis estudios urbanos.", "seis estudio urbano.", "seis estudios peruanos.", "los estudios urbano.", "dios estudios urbano.", "pons estudios urbano."
"series spain urbano." » "services spain urbano.", "shrines spain urbano.", "strikes spain urbano.", "series espacio urbano.", "series spain durango.", "series motin urbano."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("series spain urbano.") or ((("seis estudios urbano.") or ("dos estudios americanos."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("series spain urbano.") OR ((("seis estudios urbano.") OR ("dos estudios americanos.")))).
• Removing quotes may allow a broader search: (( series spain urbano. ) or ((( seis estudios urbano. ) or ( dos estudios americanos. )))).
• Adding a wildcard symbol may retrieve word variants: (("series spain urbano.") or ((("seis estudios urbano.") or ("dos estudios americanos."))))*.