like: từng tá một
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BEGINNER LEVEL
exact:
VNEN 
từng tá một * ☊ 
by the dozen * ☊
[ từng ] : (1) (present perfect marker); (2) each, one by one, every; (3) layer, level, step; (4) to experience; (5) by, for; (6) [CL counter for units of floors of stories], layer, story (of a building)
[ tá ] : dozen
[ một ] : one; a, an
[ tá ] : dozen
[ một ] : one