Here's a title search. Try something like CMPE or Script.
Use the following for a full text search. This takes longer, but search the content of the pages and show the search terms matches in context.
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'.