Here are some good starting points for browsing.

Here's a title search. Try something like wiki or sandwich.

Plugin 'TitleSearch' does not exist.

Use the following for a full text search. This takes a few seconds. The results will show all lines on a given page that contain a match.

Plugin 'FullTextSearch' does not exist.

In a !FuzzyPage? search the titles of all pages are examined to find those which are similarly spelled or similar sounding (english).

Plugin 'FuzzyPages' does not exist.

Separate words with a space. All words have to match.
To exclude words prepend a '-'.
Example: 'wiki text -php' looks for all pages containing the words 'wiki' and 'text', but not containing the word 'php'.

PHP Warning

Warning: "include_once(lib/plugin/TitleSearch.php): failed to open stream: No such file or directory" (...repeated 3 times)