Đăng bởi Hoàng Oanh
"vi-tri-dia-ly-trieu-tien"
"dac-diem-tu-nhien-trieu-tien"
"nen-kinh-te-trieu-tien"
"van-hoa-va-xa-hoi-trieu-tien"
"dan-so-cua-trieu-tien"
"cac-su-that-thu-vi-ve-quoc-gia-trieu-tien"