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nghien cac » nghiep cach, nghien cuu, nghiep cay
cac cong » cua cong
cong hoc » dong hoc, cong hoa, cong coc
phat dan » hat dan, phan dang, pham dang
cac hoc » cach hoc, cac hop, bac hoc
hoc van » hoc dan, hoc va, hoc vat
hoc xa » hoc ma
hoa » khoa
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