\u0110\u1ea1i s\u1ed1 – Ch\u01b0\u01a1ng 1 – B\u00e0i 8: M\u1ed9t s\u1ed1 b\u00e0i to\u00e1n th\u01b0\u1eddng g\u1eb7p v\u1ec1 \u0111\u1ed3 th\u1ecb<\/a><\/blockquote><\/iframe>