I tried it out and it doesn't seem to support unicode well.

I searched for "学校" (Japanese: gakkou, school) in Japan and the results page was headed with "%E5%AD%A6%E6%A0%A1".

Additionally, the actual results weren't great; it found a 2014 movie and a handful of Amazon/Youtube searches that aren't accurate. Some of the Youtube search results weren't even Japanese, but Chinese.

Just in case I'd weirdly picked a bad word (dubious since school closings etc. are all over the news), I also tried パンくん (Japanese: pan-kun, the name of a chimpanzee who was famous for being with Shimura Ken, a recently deceased comedian), which is currently trending on Twitter.

I didn't get any trend information at all.