Filtering out a duplicated anomaly

[Noor A. Al Azzawi]

I'm trying to filter out a duplicated anomalies and I tried the word duplicate but it did not work. I'm using JQL in my search with other filters and they all worked except removing the duplication. 

Thank you  

[Jack Brickey]

What constitutes a duplicate anomaly? Is it the summary or some field or something else?

[Noor A. Al Azzawi]

In my project I have multiple sub projects and I want to filter out the duplicated ones.