This is the 687th most frequent Vietnamese word.
tây
"Western" or "West"
In this sentence, 'tây' is short for 'người tây', which refers to Western people or foreigners from Western cultures.
Người tây thường ăn bánh mì vào buổi sáng.
Western people often have bread for breakfast.
Here, 'tay' is used twice: 'tay trái' means 'left hand' while 'tay phải' means 'right hand'. In informal speech, 'tay tây' can be a playful phrase contrasting directions.
Anh ấy thuận tay trái chứ không phải tay tây.
He is left-handed, not right-handed.
The word 'tây' means 'west' in this context, referring to the geographical direction.