[Therion] Wiki search finds not much

I noticed just now that the search at the top of the Therion wiki page does not return many results. https://therion.speleo.sk/wiki/doku.php For example, searching for 'history' (without quotes) returns no results, and yet on the wiki start page there is a link "History of Therion" And searching for 'survex' finds two results, on the tips page, but does not find the three instances of "survex" on the start page. I'm sure there must be many more references to survex. I am using Chrome on Windows 10 Bruce