There is an issue with the Search bar in Canvas which is case / character sensitive (and it should not). It's particularly important for languages that use various accents.
For example, if I search for "démo" in French, it will find the courses including this word, but it will not find those spelled "demo" without an accent on the "e" and vice versa.
The search bar should react the same way as any browser search bar and display all results whether there is an accent or not.