C_i n_ng oi b_c c_a m_a h_ khi_n cho c_ th_ c_a ch_ng ta m_t m_i, h_ _i_u h_a kh_ng m_t ho_c k_m l_nh l_ ng__i d_n th__ng g_i th_ __n n_p gas cho _i_u h_a nh_ m_nh nh_ng m_t s_ th_ _i_n l_nh n_m b_t ___c _i_m y_u c_a ng__i d_n n_n th__ng b_o gi_ c_t c_. Ng__i d_n hoang mang kh_ng bi_t n_n t_m __a _i{