I have been creating câu đố & some of them aren't there any more. Why are they going away? And can I get them back?

They are being deleted because they are duplicate questions. I have left các bình luận for bạn letting bạn know they are duplicates. There is a "search club" option near the hàng đầu, đầu trang of the page where bạn can check to see if a câu hỏi has already been asked before bạn post it. People who have been doing this trivia for awhile get really tired of các câu hỏi that are asked over and over and báo cáo them to be deleted. Hope this các câu trả lời your question.