Hello Didem,
Welcome to Atlassian Community!
As it may be needed further assistance on that, I have raised a support request ticket for you, you can check it on: JST-675487
It is possible that you would need to upload a font (TTF or TTC font file) on your Confluence site in order to be able to export the PDF with the characters desired.
But if you are unable to, we can provide further assistance on the support request.
You should have received an e-mail with more details about it. :)
Cheers,
Jessica
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