C\u00f4ng b\u1ed1 s\u1ed1 nguy\u1ec7n v\u1ecdng \u0111\u0103ng k\u00ed x\u00e9t tuy\u1ec3n t\u1ea5t c\u1ea3 c\u00e1c tr\u01b0\u1eddng \u0110H tr\u00ean c\u1ea3 n\u01b0\u1edbc<\/a><\/blockquote><\/iframe>