Google Complete Operator

site restricts results to sites within the specified domain
ex. site:google.com fox will find all sites containing the word fox, located within the *.google.com domain


intitle restricts results to documents whose title contains the specified phrase
ex.intitle:fox fire will find all sites with the word fox in the title and fire in the text

allintitle restricts results to documents whose title contains all the specified phrases
ex.allintitle:fox fire will find all sites with the words fox and fire in the title, so it's equivalent to intitle:fox intitle:fire

inurl restricts results to sites whose URL contains the specified phrase
ex.inurl:fox fire will find all sites containing the word fire in the text and fox in the URL

allinurl restricts results to sites whose URL contains all the specified phrases
ex.allinurl:fox fire will find all sites with the words fox and fire in the URL, so it's equivalent to inurl:fox inurl:fire

filetype, ext restricts results to documents of the specified type
ex.filetype:pdf fire will return PDFs containing the word fire, while filetype:xls fox will return Excel spreadsheets with the word fox numrange restricts results to documents containing a number from the specified range numrange:1-100 fire will return sites containing a number from 1 to 100 and the word fire. The same result can be achieved with 1..100 fire

link restricts results to sites containing links to the specified location
ex.link:www.google.com will return documents containing one or more links to www.google.com

inanchor restricts results to sites containing links with the specified phrase in their descriptions
ex.inanchor:fire will return documents with links whose description contains the word fire (that's the actual link text, not the URL indicated by the link)

allintext restricts results to documents containing the specified phrase in the text, but not in the title, link descriptions or URLs
ex.allintext:"fire fox" will return documents which contain the phrase fire fox in their text only

+ specifies that a phrase should occur frequently in results
ex.+fire will order results by the number of occurrences of the word fire

- specifies that a phrase must not occur in results
ex.-fire will return documents that don't contain the word fire

"" delimiters for entire search phrases (not single words)
ex."fire fox" will return documents containing the phrase fire fox

. wildcard for a single character fire.fox will return documents containing the phrases fire fox, fireAfox, fire1fox, fire-fox etc.
* wildcard for a single word fire * fox will return documents containing the phrases fire the fox, fire in fox, fire or fox etc.

| logical OR "fire fox" | firefox will return documents containing the phrase fire fox or the word firefox