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thuc thien » thuc hien, thua thien, thuc tien
nguoi sach » nguoi san, nuoc sach
thien cac » hien cac, thien cau, thieu cac
hoat toan » hoa toan, thuat toan, hoach toan
dao nguoi » cho nguoi
sach khoa » bach khoa, sach nha, anh khoa
hoc thong » hoc thuong, hoc trong, hoc hong
cac thuc » cach thuc, cac thu, can thuc
cac hoat » cao hoat, cac khoan, cac thuat
sach dao » lanh dao
khoa hoc » hoa hoc
tu sach » thu sach, su sach, te sach
su cac » tu cac, su cao, su can