Perhaps you should try some spelling variations:
"la existencia social. tercera decada." » "la resistencia social. tercera decada.", "la asistencia social. tercera decada.", "la distancia social. tercera decada.", "la eficiencia social. tercera decada."
"las ciencies socials. tercera decada." » "las ciencias sociales. tercera decada.", "las ciencia social. tercera decada.", "las ciencas sociales. tercera decada.", "las ciencias socials. tercera decada.", "les ciencies socials. tercera decada.", "las ciencas socials. tercera decada."

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