This is the 624th most frequent Vietnamese word.
the
"The" in Vietnamese means "card" or "ticket," depending on context.
In this sentence, 'thế' is used to mean 'so' or 'therefore', introducing a result from the previous statement.
Tôi cần một cuốn sách để đọc, nhưng tôi không biết chọn cuốn nào, vì thế tôi đã hỏi bạn tôi.
I needed a book to read, but I didn’t know which to choose, so I asked my friend.
In this context, 'Thế giới' means 'world', where 'thế' pertains to the idea of 'the world' or 'this world' as a whole.
Thế giới này thật là rộng lớn.
This world is truly vast.
Here, 'thế mà' conveys a sense of mild surprise or emphasis, roughly meaning 'surprisingly' or 'to such an extent' in this context.