I have a long document (A4 * 170 pages) with some CJK fonts, where some of the \subject{...} are placed at the end of the corresponding pages, which looks awkward. How can one flush those last-line titles to the next pages?

Currently I don't have a MWE, as trivial filling-up with 1-2 pages of \lipsum doesn't reproduce the problem. I'm optimistically asking without MWE, but if it is necessary anyway, please tell me and I will obfuscate the 170-page document and find a way to upload it.

Many thanks,

Sylvain