Perhaps you should try some spelling variations:
"atlas asistencia social. tercera decada." » "la asistencia social. tercera decada.", "las asistencias social. tercera decada.", "armas resistencia 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."

Try widening your search to All Fields.

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