Perhaps you should try some spelling variations:
"unidas didacticas." » "unidades didacticas.", "unidad didactica.", "guias didacticas."
"guia didactica." » "guia practica.", "la didactica.", "unidad didactica."
"una didactica." » "la didactica.", "unidad didactica.", "y didactica."
"una practica." » "guia practica.", "la practica.", "y practica."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("unidas didacticas.") or ((((("una didactica.") OR ("una practica."))) or ("guia didactica."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("unidas didacticas.") OR ((((("una didactica.") OR ("una practica."))) OR ("guia didactica."))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"unidas didacticas.\") or (((((\"una didactica.\") OR (\"una practica.\"))) or (\"guia didactica.\"))))*".
• Removing quotes may allow a broader search: (( unidas didacticas. ) or ((((( una didactica. ) OR ( una practica. ))) or ( guia didactica. ))))*.