Perhaps you should try some spelling variations:
"las ciencas sociales. tercera decada." » "las ciencias sociales. tercera decada.", "las ciencia social. tercera decada.", "las cuencas sociales. tercera decada.", "las fincas sociales. tercera decada."
"les ciencies socials. tercera decada." » "les ciencias sociales. tercera decada.", "les ciencia social. tercera decada.", "les science social. tercera decada.", "las ciencias socials. tercera decada.", "les audiencies socials. tercera decada."

Try widening your search to All Fields.

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

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