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nuoc sach » nguoi sach, hoc sach, cuoc cach
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » bach khoa, cac khoa, cac khoan
noi thong » noi khong, noi tong, hoi thong
pho thong » he thong
sach tri » sach tai, sach tren, sach truc
tri thuc » tri tue
khoa noi » khoa doi, khoa hoi, khoan nhoi
cao khoa » lao khoa, bao khoa, cac khoa
khoa pho » khoa phu, khoa khoa, khoa phau
tu sach » thu sach, su sach, te sach
tri phu » thi phu, tri phan
phu cao » phu can, phung cao, phuc cam