How can I understand the recurring tickets for a specific issue?

How can I understand the recurring tickets for a specific issue?

Hi guys, 

I just want to learn that how I can clarify the recurring problems for a specific issue. Let's say, we resolve an issue as ticket number 1 and closed the ticket. After a while, the customer created another ticket(number 2) and it is about the problem I resolved before. How can I realize that I couldn't fully complete the problem by looking at these 2 tiered tickets are actually one.