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thu sach » tu sach, thuat sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
lang dau » hang dau, xang dau, nang dau
cuu mot » cua mot, huu mot, cuu vuot
va lang » va nang, hoa lang
ma hoi » mai hoi, xa hoi, ma hoa