Posts not updated for logged-out users

Hi,

I have this page where people post questions and I answer them:
https://www.toeicmoingay.com/hoi-dap/

Logged-out users sometimes don’t see updated posts and new answers.

I have checked both the options “Clear cache files when a post or page is published
and “Clear cache files when a post or page is updated”.

Is there a way that I can cache this page and clear the cache whenever I update a post and have a new answer?