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thuoc sinh » hoc sinh, thu sinh, thuoc sach
sach khoa » bach khoa, sach nha, anh khoa
tai thuoc » tri thuoc, bai thuoc, tac thuoc
sinh khoa » sinh hoc, sinh hoat, anh khoa
khoa toan » khoa than, hoa toan, khoa luan
sach tai » sach bai, sach tham, sach dao
hoc sach » hoc sinh, hoc cac, hoc anh
su sach » so sach, vu sach
tai hoc » thai hoc, dai hoc, bai hoc
khoa he » hoa he, khoa hoc, khong he
te sach » toc sach
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