If the quick fixes don't work, the app itself might have corrupted temporary data.

On a computer, this usually stems from browser extensions or corrupted cookies.

In your browser settings, search for "Hardware Acceleration" and toggle it OFF . Restart the browser and check if the search results reappear. Why Does This Happen?

If your device’s date/time is even slightly off, Google’s security certificates may fail, causing the app to "fail safe" into an offline/download-only state. Set your date and time to Automatic in your system settings. Troubleshooting the YouTube App (Android & iOS)

Instead of clearing your entire history, you can clear just your YouTube cookies. In Chrome, go to Settings > Privacy and security > Third-party cookies > See all site data and permissions , search for "YouTube," and hit the trash icon.