All of the words
The AND operator includes ALL keywords in your search. Results must have ALL words, in any order, in any position, within the document.
At least one of the words
Using the OR operator between keywords returns documents containing ANY of the words. Example: rhino OR rhinoceros OR unicorn returns results containing any one of these words.
None of the words
The (minus) - operator excludes any page with this word from the results. Example: spaghetti -meatballs only returns documents containing spaghetti without the word meatballs.
The exact phrase
A phase within double quotation marks will appear in results exactly as you write it. Example: 'to be, or not to be.' Remember, Google is not case sensitive; capitalization is ignored.
Focus your search on all sites within a single domain. Example: site:edu searches all .edu websites. Also used to search within a specific site. Example: site:nasa.gov returns results from just NASA's website.
Eliminates a selected domain from your search. Example: -site:com removes all .com sites from your results.
Narrows search to one file type. The most common file type is Hypertext Markup Language (html); others include, Adobe (pdf) and Microsoft (.doc, .xls, .ppt). Example: filetype:doc returns Word documents.
Eliminates one file type from your search. The most common file type extensions are html, pdf, doc, and ppt. Example: -filetype:html removes all files ending in .html from your results.
This special operator locates other websites that link to the website you are evaluating. Example: link:21cif.com will return a list of all sites that link to the 21st Century Information Portal.
The tilde ~ operator in front of a keyword retrieves documents with that word and the word's 'nyms'. Nyms are types of words that focus or expand a search. Example: ~cat returns results for cat, kitty, pet, and animal.
How Google Works