Now you will only see those apple sites that also have the word green on them.  This will still give you about 6 million websites. To narrow the search even more eliminate the word “computers” by typing this:

We still have about 5 million web pages to check out.  A final way to narrow the search is to use quotes to narrow the search to an exact phrase.  For example if what we’re really interested in is granny smith apples we could type “granny smith” in quotes. 

This is called an exact phrase search and this is also how you catch a plagiarists.  If you see an sentence that you suspect has been plagiarized from the internet all you have to do is type that sentence into Google, in quotes, and you'll find the exact website that the text might have been copy & pasted from.