How's English proficiency (and American braille code proficiency) like in Vietnam? Keep in mind that most blind people who speak English fluently but don't liv

How's English proficiency (and American braille code proficiency) like in Vietnam? Keep in mind that most blind people who speak English fluently but don't live in an English-speaking country (myself included) can't read English braille, or at least not well. Because of how voluminous Braille is, it uses contractions, single characters that replace common words and character combinations like "the", "would", "ing" or "ed". Those tend to be language specific, never taught outside their country or countries of use, and hard to get accessible electronic materials for. The math codes are completely different too, we use something derived from Marburg, while English-speaking countries use Nemeth. Even basic characters like + and - differ between those two, not to mention more complicated structures. It's not just the dot patterns that are different but also the design principles, like where you put spaces or when you can omit "begin fraction" / "end fraction" characters.