B\u00ed quy\u1ebft \u00f4n luy\u1ec7n m\u00f4n Ng\u1eef v\u0103n: C\u00e1ch vi\u1ebft b\u00e0i ngh\u1ecb lu\u1eadn x\u00e3 h\u1ed9i (ph\u1ea7n 1)<\/a><\/blockquote><\/iframe>