How to Find Entries Without a PDF Attachment

Dear Zotero Experts,

Is there a way to use the advanced search feature, or another feature, to find all of the items without a PDF attachment? Specifically, I have captured many items overtime that seem to be related to my dissertation topic based on the title and abstract, but I do not have a PDF of the article or book section and I have not taken the time to find the content until now. I am starting to search for the content of the books and articles I want to read. I am trying to find an easy way to find all the items in my library that do not have a PDF attachment. Thank you in advance for your help.

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