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sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
khoa hoc » hoa hoc
van luan » van quan, van tuan, von luan
su sach » so sach, vu sach
dong so » dong son, dong co, cong so
so toan » so tan, so than, bao toan
hai van » thai van, ha van, hai tan
ma hai » ta hai, va hai, xa hai
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
khoa hoc » hoa hoc
van luan » van quan, van tuan, von luan
su sach » so sach, vu sach
dong so » dong son, dong co, cong so
so toan » so tan, so than, bao toan
hai van » thai van, ha van, hai tan
ma hai » ta hai, va hai, xa hai
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