Ch\u01b0\u01a1ng 7 – B\u00e0i 37: Luy\u1ec7n t\u1eadp: T\u00ednh ch\u1ea5t h\u00f3a h\u1ecdc c\u1ee7a s\u1eaft v\u00e0 h\u1ee3p ch\u1ea5t c\u1ee7a s\u1eaft<\/a><\/blockquote><\/iframe>