Internet searching algorithm:
Searching: When a user enters a query into a search engine, the engine examines its index and provides a listing of best-matching web pages according to its ranking criteria. This short list, usually, have a short summary containing the title of the document and small part of the text. Most search engines support Boolean search. Some simple example of a search is given below: To find website which contains -java tutorial?, you may type Java tutorial in the search box of the browser. The search will look for keywords -Java? AND -Tutorial?;  the search expression will retrieve all those records where both the terms occur.  

If you are looking for Tutorials that are not related to Java then you may use the search expression as -Tutorials? AND (NOT -Java?)