Perhaps you should try some spelling variations:
"sistema la gestion de bases de datos." » "sistema da gestion de bases de datos." (Expand Search), "sistema a gestion de bases de datos." (Expand Search), "sistema das gestion de bases de datos." (Expand Search), "sistema la gestion de base de datos." (Expand Search), "sistema la gestion de cases de datos." (Expand Search)
"sistema la gestion de based de datos." » "sistema da gestion de based de datos." (Expand Search), "sistema a gestion de based de datos." (Expand Search), "sistema das gestion de based de datos." (Expand Search), "sistema la gestion de base de datos." (Expand Search), "sistema la gestion de babel de datos." (Expand Search), "sistema la gestion de bayes de datos." (Expand Search), "sistema la gestion de bases del datos." (Expand Search), "sistema la gestion de based _ datos." (Expand Search)

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