From Google’s official page,
Symbol How to use it
Search for Google+ pages or blood types
Find social tags
Find popular hashtags for trending topics
When you use a dash before a word or site, it excludes sites with that info from your results. This is useful for words with multiple meanings, like Jaguar the car brand and jaguar the animal.
jaguar speed -caror
When you put a word or phrase in quotes, the results will only include pages with the same words in the same order as the ones inside the quotes. Only use this if you’re looking for an exact word or phrase, otherwise you’ll exclude many helpful results by mistake.
"imagine all the people"
Add an asterisk as a placeholder for any unknown or wildcard terms. .
"a * saved is a * earned"
Separate numbers by two periods without spaces to see results that contain numbers in a range.
Operator How to use it
Get results from certain sites or domains.
Find sites that are similar to a web address you already know.
Find pages that might use one of several words.
marathon OR race
Get information about a web address, including the cached version of the page, similar pages, and pages that link to the site.
See what a page looks like the last time Google visited the site.
Note: When you search using operators or punctuation marks, don’t add any spaces between the operator and your search terms. A search for
site:nytimes.comwill work, but
“YOUR SEARCH TERM HERE” -inurl:(htm|html|php|pls|txt) intitle:index.of “last modified” (mp3|wma|aac|flac)
“YOUR SEARCH TERM HERE” -inurl:(htm|html|php|pls|txt) intitle:index.of “last modified” (mkv|mp4|avi)