Search Site 

Keywords should be written with commas or spaces between them. The case is not important. 
The search type "AND" means that Search will find files which contain ALL keywords. The search type "OR" means that script will find all files which contain at least one keyword. In any search regime mark "+" before keyword means that this keyword should be in returned pages. In order to exclude word from results type "-" before keyword, for example "+calculator -clock". 
By default script will return any files where it finds the keywords. For example, if you ask "port", Search will find all pages with words "poet", "important", "portrait", "sport", "report" and so on (look at "Indexing" guide). If you wish to find exact word, put exclamation mark
after keyword: "port!".