What is the meaning of Trời?

sky

weather

generic deification of the sky that is said to be able to grant "natural gifts" (talent, good weather, etc.) and deal heavenly "punishments" (storms, lightning, etc.); he may be conflated with the Ngọc Hoàng (Jade Emperor) borrowed from Chinese myths; the heavenly lord; compare Chinese 老天 (lǎotiān, literally old heaven)

wild

Used after ngày, tháng, or năm to emphasize a lengthy duration

good Lord!

Source: wiktionary.org