B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m V\u1eadt L\u00ed 12: T\u00ednh ch\u1ea5t v\u00e0 c\u1ea5u t\u1ea1o h\u1ea1t nh\u00e2n (ph\u1ea7n 2)<\/a><\/blockquote><\/iframe>