Perhaps you should try some spelling variations:
"las cienicas sociales. tercera decada." » "las ciencas sociales. tercera decada.", "las ciencias sociales. tercera decada.", "las ciencis sociales. tercera decada.", "las cineticas sociales. tercera decada."
"las science social. tercera decada." » "las science sociology. tercera decada.", "a science social. tercera decada.", "years science social. tercera decada.", "clil science social. tercera decada."

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("las cienicas sociales. tercera decada.") OR ("las science social. tercera decada."))~.
• Removing quotes may allow a broader search: (( las cienicas sociales. tercera decada. ) or ( las science social. tercera decada. ))~.
• Adding a wildcard symbol may retrieve word variants: (("las cienicas sociales. tercera decada.") or ("las science social. tercera decada."))*.