Ph\u00e2n d\u1ea1ng v\u00e0 c\u00e1c ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i to\u00e1n chuy\u00ean \u0111\u1ec1 gi\u1edbi h\u1ea1n – Tr\u1ea7n \u0110\u00ecnh C\u01b0<\/a><\/blockquote><\/iframe>