Perhaps you should try some spelling variations:
"entorno virtuales oecc." » "entornos virtuales oecc.", "entorno virtual oecc.", "entorn virtual oecc.", "entorno virtuales de.", "entorno virtuales en.", "entorno virtuales tic."
"entornos visuales en." » "entornos virtuales en.", "entornos digitales en.", "entornos locales en.", "entornos visual en."
"estudios visuales del." » "estudios sociales del.", "estudios visuales de.", "estudios visual del.", "estudios visual de."

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: (("entorno virtuales oecc.") or ((("entornos visuales en.") or ("estudios visuales del."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("entorno virtuales oecc.") OR ((("entornos visuales en.") OR ("estudios visuales del.")))).
• Removing quotes may allow a broader search: (( entorno virtuales oecc. ) or ((( entornos visuales en. ) or ( estudios visuales del. )))).
• Adding a wildcard symbol may retrieve word variants: (("entorno virtuales oecc.") or ((("entornos visuales en.") or ("estudios visuales del."))))*.