Note that the search will normally look for a match on the complete word or phrase. If you want to search on a partial word append the partial word with an asterisk("*"). Thus "snow" will only match on the word "snow" but "snow*" will match on "snow", "snowing" and "snowsnake". Simple boolean AND searches are possible so, for example, "louise and piran" will search from items that conatin bother the word "louise" and the word "piran". It is not possible, at the moment, to combine both a partial search and a boolean search.
Documents stored on the site in HTML or PDF can be searched but text in scanned documents cannot be indexed and searched. This means content in some of the older documents (predating the web site in 2001) will not be searched.