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tren thuoc » trien thuoc, tren thuc, trung thuoc
nguoi sach » nguoi san, nuoc sach
sach tren » sach tien, sach tranh
thuoc ban » thuoc tan, thuoc dang, thu ban
tin nguoi » tinh nguoi, ten nguoi, tin nguong
sach khoa » bach khoa, sach nha, anh khoa
hoi khong » khoi khong, hoa khong, noi khong
ban khoa » san khoa, van khoa, ba khoa
sach tin » sach tien, sach kinh, sach han
khoa hoi » khoan hoi, khoa hoc, khoa doi
te sach » toc sach
khoa he » hoa he, khoa hoc, khong he
tu sach » thu sach, su sach, tu cach