tuy nhiên tôi không thể quay lại cử

tuy nhiên tôi không thể quay lại cửa hàng vài ngày sau đó bởi vì tôi khá bận với kì thi cuối kì

Results (English) 1:

however I can not go back to the store a few days later because I am pretty busy with final exams period

Results (English) 2:

However, I couldn't go back to the store a few days later because I was quite busy with the last exam

Results (English) 3:

But I can't go back to the store a few days later because I'm pretty busy with my final exams.