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cac thuat » va thuat, hoc thuat, cac thu
thuat anh » thuat lanh, thuat canh, thuat nganh
hoc thong » hoc thuong, hoc trong, hoc hong
thieu hoc » hieu hoc, tieu hoc, thieu so
sach cac » sach cap, sach bac, sach dao
anh khoa » doanh khoa, hang khoa
khoa hoc » hoa hoc
cac khoa » cac khoan, cac khoi, dac khoa
tu sach » thu sach, su sach, te sach
hoc cac » hoc cao
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