In this case the best would be to describe the exact problem you have, with the steps you’re taking and the things you see on the screen, with screenshots - you can black the areas of the screen that contain sensitive content.
I made a couple of assumptions in my answer, in order to be able to help we need to confirm or infirm those assumptions.
Please include the URLs in the screenshots.
If I understand correctly, you do see a correct search UI, it’s just that you have 0 results in that UI instead of the pages you expect to find, right?
Note that the search behaviour can also depend a lot on the language settings of the wiki and of those pages, which impact how they’re indexed and how they’re found. If you’re making a global wiki search (using the UI from the top navigation bar), are those pages found or they’re not found in that case either?