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thuat sach » thuat lanh, thuat san
cach khong » cach phong, cac phong, bach khang
thuc cach » thuoc sach, truoc cach, thuc hanh
sach tren » sach tien, sach tranh
tren thuc » trien thuc, tron thuc, trinh thuc
cach khoa » bach khoa, cac khoa, cac khoan
hoc thong » hoc thuong, hoc trong, hoc hong
cach noi » cach thoi, hanh noi, anh noi
noi thuc » choi thuc, nghi thuc, cuoi thuc
khong he » khong khi, hong ha, khong _
khoa hoc » hoa hoc
tu cach » tu cac