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thuoc anh » thuoc thanh, thuoc dang, thuoc sach
tri thuoc » tri thuc, tri hoc, tin thuoc
hoc thong » hoc thuong, hoc trong, hoc hong
anh khoa » doanh khoa, hang khoa
khoa hoc » hoa hoc
tu sach » thu sach, su sach, tu cach
te sach » toc sach