The results are not sorted by creation date, they are already sorted by the last applicable bump time.
Valid bumps to trade topics will now also bump them in the search results! (Feb 4 2022)
This only applies to bumps made after this update went live
At present, they will show in the first page(s), but not necessarily sorted to the top
https://forums.d2jsp.org/topic.php?t=92302787&f=28