Ch\u01b0\u01a1ng 4 – B\u00e0i 32: V\u1ea5n \u0111\u1ec1 khai th\u00e1c th\u1ebf m\u1ea1nh \u1edf Trung du v\u00e0 mi\u1ec1n n\u00fai B\u1eafc B\u1ed9<\/a><\/blockquote><\/iframe>