dưới ánh mặt trời nó rực rỡ.

beneath the sun it was radiant. ✎ The original title "hướng dương" is a wordplay meaning both "sunflower" and "towards the sun". I have chosen the former one, because it embodies both meanings.

những ngôn từ chứa đựng tấm lòng con tuổi thanh xuân mang gửi mẹ.

uttering words that held the heart of the young me for my mother.