"That famous book has twenty-nine versions."
Translation:Cuốn sách nổi tiếng đó có hai mươi chín phiên bản.
It is though, I'm not sure what you're getting at. Are you questioning why you can't type the digits? If so, they want you to type the words in full.
I was doing the activity where the statement was written in English. And you had to click the viet words to match the sentence. The "muoi" part was not in one of the selections. So it came out to be "hai chin". I got it right, but it confused me which prompted me to comment. Must be a programming error.