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nghiep bao » nghiep giao, nghiep va, nghiep tai
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phan khoa » pham khoa, nhan khoa, phan hoa
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hoc phan » hoc dan, hoc pho
khoa hoc » hoa hoc
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cach hoc » cach thuc, cach thoi, dich hoc
hoc tac » hoc tach, hoc cac, hoc mac
tac hai » tuc hai, tac ha, tai hai
hai van » thai van, ha van, hai tan
tu cach » tu cac