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cach khoa » bach khoa, cac khoa, cac khoan
hoc thong » hoc thuong, hoc trong, hoc hong
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
thuc cach » thuoc sach, truoc cach, thuc hanh
phu thong » pho thong, phap thong, khau thong
sach tri » sach tai, sach tren, sach truc
tue cach » tu cach, ve cach, cuu cach
khoa hoc » hoa hoc
khoa phu » khoa phau, khoa thu, hoa phu
tu sach » thu sach, su sach, tu cach
te sach » toc sach