Perhaps you should try some spelling variations:
"Bases de datos formularios concursales" » "Bases de datos formularios procesales" (Expand Search), "Bases de los formularios concursales" (Expand Search), "Bases de reales formularios concursales" (Expand Search), "Bases de con formularios concursales" (Expand Search)
"Bases de datos formularios generales" » "Bases de datos formularios laborales" (Expand Search), "Bases de datos formularios procesales" (Expand Search), "Bases de datos formularios notariales" (Expand Search), "Bases de los formularios generales" (Expand Search), "Bases de reales formularios generales" (Expand Search), "Bases de con formularios generales" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("Bases de datos formularios generales") OR ("Bases de datos formularios concursales"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"Bases de datos formularios generales\") OR (\"Bases de datos formularios concursales\"))".
• Removing quotes may allow a broader search: (( Bases de datos formularios generales ) OR ( Bases de datos formularios concursales )).
• Adding a wildcard symbol may retrieve word variants: (("Bases de datos formularios generales") OR ("Bases de datos formularios concursales"))*.