How to search pdfs in a collection?

Hello everyone!

I want to search pdfs in a collection for a specific term. How to do this?

I made an advanced query:
see screenshot: https://drive.google.com/file/d/1KpCxEZoidTIQNh-ZacCVCH0ldcDi4LLS/view?usp=sharing

but gives no results.

How to do this?

Thank you so much,
Frederik
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