like: vào thế kỷ thứ X: in the X-th century
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VNEN 
vào thế kỷ thứ X: in the X-th century * ☊ 
* ☊
[ vào ] : at, on (date), in, to; to enter, go in, access
[ thế ] : (1) manner, way, fashion, position, situation, posture; (2) so, thus, like that, such
[ kỷ ] : (1) order, discipline; (2) small table, bench; (3) self; (4) to write, record; (5) cycle, era; (6) 6th cycle of the twelve years of the Chinese zodiac
[ thứ ] : (1) (ordinalizer); order, type, suit, kind; (2) thing, item
[ vào ] : enter