Ch\u01b0\u01a1ng 3 – B\u00e0i 27: V\u1ea5n \u0111\u1ec1 ph\u00e1t tri\u1ec3n m\u1ed9t s\u1ed1 ng\u00e0nh c\u00f4ng nghi\u1ec7p tr\u1ecdng \u0111i\u1ec3m (ti\u1ebfp 2)<\/a><\/blockquote><\/iframe>