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exact: like: thư bảo đảm
VNEN 
thư bảo đảm * ☊ 
registered letter, registered mail * ☊
[ thư ] : letter; to write
[ bảo ] : (1) to say, order, tell (someone to do something); (2) to insure; (3) to protect, guard; (4) precious, valuable
[ đảm ] : to bear, take
2000VIET thư bảo đảm certified mail