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

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 ((("estudios sociales oecc.") OR ("estudios sociales del."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("entorno virtuales oecc.") OR ((("estudios sociales oecc.") OR ("estudios sociales del."))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"entorno virtuales oecc.\") or (((\"estudios sociales oecc.\") OR (\"estudios sociales del.\"))))*".
• Removing quotes may allow a broader search: (( entorno virtuales oecc. ) or ((( estudios sociales oecc. ) OR ( estudios sociales del. ))))*.