Seems that the algorithm is not showing the appropriate results when a word has apostrophe. For example typing "etre" does not suggest "être". A custom third-party spell checker library - NHunspell can be used. SDK Example demonstrating this approach can be found in our XAML-SDK portal: https://github.com/telerik/xaml-sdk/tree/master/RichTextBox/NHunspellSpellChecking
Thank you for the feedback and the additional information, Alain. The item is now corrected.
You wrote "apostrophes", but the problem is with the "accents" The problem doesn't seem to be with all the words. > evenement (événement) > ecole (école) > etre (être)