If you search for the K-pop band named “시크릿”, the default sort-by-relevancy will put their videos at the top of the list. If you switch to sorting by upload date, however, you will see only a long list of completely irrelevant videos whose titles happen to include the English word “secret”, which is what 시크릿 spells out phonetically.
The underlying idea makes some sense, but it’s not applied evenly or consistently. Many videos will not be found if you search for them in the wrong/other syllabary (a different subset will be found by searching for シークレット, for instance). Fortunately, putting double quotes around the string disables the auto-translation, excluding irrelevant results.