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tri thuoc » tri thuc, tri hoc, tin thuoc
thuoc cac » thuoc cuc, thuoc cao, thuoc dac
hoi ngoai » phoi ngoai, hoc ngoai, doi ngoai
sach tri » sach tai, sach tren, sach truc
cac khoa » cac khoan, cac khoi, dac khoa
khoa hoc » hoa hoc
thu sach » tu sach, thuat sach, thuoc sach
thu hang » thi hang, thuc hanh, thu huong
hang hoi » hang hoa, hang hai, hang doi
vu sach » vu bach, su sach, vu khach
tri thu » tri thuc, thi thu, tri phu
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