Perhaps you should try some spelling variations:
"las ciencies socialses. tercera decada." » "las ciencias sociales. tercera decada.", "las ciencies socials. tercera decada.", "las ciencis sociales. tercera decada.", "les ciencies socialses. tercera decada.", "las ciencas socialses. tercera decada.", "las creencias socialses. tercera decada."
"las ciencias social. tercera decada." » "las ciencia social. tercera decada.", "las ciencias sociales. tercera decada.", "las ciencies socials. tercera decada."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("las ciencias social. tercera decada.") or ("las ciencies socialses. tercera decada."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("las ciencias social. tercera decada.") OR ("las ciencies socialses. tercera decada.")).
• Removing quotes may allow a broader search: (( las ciencias social. tercera decada. ) or ( las ciencies socialses. tercera decada. )).
• Adding a wildcard symbol may retrieve word variants: (("las ciencias social. tercera decada.") or ("las ciencies socialses. tercera decada."))*.