how to fix googleadservice.com issue?

I understand the links provided by a Google search stall or don't load, but did you try using a different search engine?

The links returned by Google incorporate tracking codes in the URL so that is a likely reason they don't load. Content-blockers will interfere with them, which is the reason I suggested uninstalling any that may be affecting its results. Uninstalling content blockers on an iPhone require removing the app; merely deactivating it might not be sufficient. I do not know if "MS Defender" is an iPhone app or not but the same recommendations apply to it.

A content-blocker is the usual reason.

If Safari doesn't open a page or work as expected on your Mac - Apple Support

If Safari isn't loading websites or quits on your iPhone, iPad, or iPod touch - Apple Support

Try uninstalling "MS Defender". It may be useful or even necessary for PCs running Microsoft Windows, but such things serve no beneficial purpose on Macs. Even if the problem should persist after its removal, it provides no benefit and should be removed in the interest of having your Mac work the way it was designed to work. Uninstall it in accordance with its instructions.