FANDOM's fulltext search does not pay attention to page titles. So while it is easy to find pages where your search term was mentioned multiple times, it is sometimes impossible to find pages that are about your search term. The SearchSuggest script adds the list of best-matching page names to the results page.
To understand the problem, go to the 24 wiki and search for Beau. There are, at the time of writing this, four pages with the word "Beau" in the page title:
The fulltext search only finds the first three of these.