We thought about this and could not come up with a very good way to search for "every day between 18:00 and 06:00" without having to do the search every day. There are some ways in the future we can do this, but no good way right now.
Unfortunately, we know we don't support Chinese (and a bunch of non-English language) characters in LEM data. There's currently no workaround for this, it's a limitation in a few areas that will require some ongoing effort. Right now we don't have a timeline, but it's a good thing for the feature request area.