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

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: (((("entornos digitales del.") OR ("entornos digitales en."))) or ("entornos digitales el."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("entornos digitales del.") OR ("entornos digitales en."))) OR ("entornos digitales el.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"entornos digitales del.\") OR (\"entornos digitales en.\"))) or (\"entornos digitales el.\"))".
• Removing quotes may allow a broader search: (((( entornos digitales del. ) OR ( entornos digitales en. ))) or ( entornos digitales el. )).
• Adding a wildcard symbol may retrieve word variants: (((("entornos digitales del.") OR ("entornos digitales en."))) or ("entornos digitales el."))*.