This is the 19719th most frequent Korean word.
없냐
"없냐" means "Is there none?" or "Don't you have it?"
The word '없냐' is used here to inquire if the book is absent or not available in this location.
네가 찾는 책은 여기에 없냐?
Isn't the book you're looking for here?
In this case, '없냐' asks about the absence of any tools required to complete the task.
그 작업에 필요한 도구들 중에서 하나도 없냐?
Isn't there even one of the tools needed for that task?
Here, '없냐' questions whether the concert tickets are not yet obtainable or in stock.