That's because you're searching search.gov, not all government websites. Besides this being what it "obviously" is doing, the error message also states this plainly:

>Are you looking for information from across government? Please search again on USA.gov. Click the "Search again on USA.gov" link above the search button here, or use the link below to go to the main USA.gov website. Search.gov is a service powering the search boxes on government agencies' websites. You are currently searching the Search.gov website, and this website only contains information about our service.

"search" returns nothing to: https://find.search.gov/search?utf8=%E2%9C%93&affiliate=usas...

This search box only searches search.gov, so it's not surprising if there are no results for topics that are not about search engines. For "Israel" you can click the "Search again on USA.gov" tab.

France, Argentina, etc all produce the same result. It would had been a fast test to discover that.

Sure, I tried one country name and it didn't work.

But spent the time to comment on it in an external forum lol.