"No hits in search" is recorded when there are no viewable manuals that can be searched with the relevant keyword within the search target range.
Please note that even if manuals containing the relevant keyword exist, the result may still be "No hits in search" in the following cases:
・The user performing the search does not have viewing privileges
・The manual is saved in a folder other than the search target folder
> The search target folder is recorded in "Folder Name" in the search log CSV.
・A detailed search such as "Title only" or "Search tag only" is being performed, and the relevant keyword is not included in the title or search tag
Related: View manual search log using report function (Web Browser)
https://teachme.jp/8/manuals/11837621