informx wrote
For example when my input is "doku" on www.dokuwiki.org, I get pages with words like DokuWiki, dokufreaks, dokuwi..., dokubook, etc. which is quiet good.
No you don't. Do not let yourself confused by the search term highlighting which isn't perfect. (I thought we had that improved, apparently not).
informx wrote
The similar behaviour is of course with other words. I can not find where is the problem.
Use wildcards. The default search does only match exact words. See
http://www.dokuwiki.org/search