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It's by design. In English, it is often the case that accents are irrelevant when searching. In other languages, accents can change the meaning of the word so should not be ignored. I dont know Vietnamese, but for example, in Spanish, n and ñ when use din an otherwise identical word can change its meaning. Therefore, accents are ignored only in English not other languages. There is a preference to turn this on or off under Preferences->Searching.
And before anyone gets confused, this applies only to searching book metadata in the main calibre interface/content server. Not to searching inside books via the calibre viewer.
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