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

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

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