Dorking

In the browser search bar, insert the following string:

"value" [query1] [query2] ...

If you want to insert spaces in the value for a query string, delimit the value with ". If you want to exclude a query from the search results prepend - to the query, as in the following example:

"test query" inurl:wapt -site:wwww

Google

Query	Description
cache:X	Show cache of X
link:X	List webpages that have links pointing to URL X
related:X	List web pages that are similar to the site X
info: X	Show information about site X
define:X Y ...	Provide a definition of the words you enter after it (X, Y, ...), gathered from various online sources
stocks:X Y ...	If you begin a query with the [stocks:] operator, Google will treat the rest of the query terms (X, Y, ...) as stock ticker symbols, and will link to a page showing stock information for those symbols
site:X	Restrict the results to those websites in the given domain X
allintitle:X Y ...	Restrict the results to those with all of the query words(X, Y, ...) in the title
intitle:X	Restrict the results to documents containing that word (X) in the title
allinurl:X Y ...	Restrict the results to those with all of the query words (X, Y, ...) in the url
inurl:X	Restrict the results to documents containing that word (X) in the url
filetype:X	Return results which are a particular file extension X

Bing

Yahoo is also based on Bing engine.

Query	Description
cache:X	Show cache of X
link:X	List webpages that have links pointing to URL X
related:X	List web pages that are similar to the site X
info: X	Show information about site X
define:X Y ...	Provide a definition of the words you enter after it (X, Y, ...), gathered from various online sources
stocks:X Y ...	If you begin a query with the [stocks:] operator, Google will treat the rest of the query terms (X, Y, ...) as stock ticker symbols, and will link to a page showing stock information for those symbols
site:X	Restrict the results to those websites in the given domain X
intitle:X Y ...	Restrict the results to those with all of the query words(X, Y, ...) in the title
inurl:X Y ...	Restrict the results to those with all of the query words (X, Y, ...) in the url
filetype:X	Return results which are a particular file extension X

DuckDuckGo

Query	Description
define:X Y ...	Provide a definition of the words you enter after it (X, Y, ...), gathered from various online sources
stocks:X Y ...	If you begin a query with the [stocks:] operator, Google will treat the rest of the query terms (X, Y, ...) as stock ticker symbols, and will link to a page showing stock information for those symbols
site:X	Restrict the results to those websites in the given domain X
inurl:X	Restrict the results to documents containing that word (X) in the url
filetype:X	Return results which are a particular file extension X

Startpage

Query	Description
site:X	Restrict the results to those websites in the given domain X
intitle:X	Restrict the results to documents containing that word (X) in the title
inurl:X	Restrict the results to documents containing that word (X) in the url
filetype:X	Return results which are a particular file extension X

Qwant

Query	Description
define:X Y ...	Provide a definition of the words you enter after it (X, Y, ...), gathered from various online sources
site:X	Restrict the results to those websites in the given domain X
intitle:X	Restrict the results to documents containing that word (X) in the title
inurl:X	Restrict the results to documents containing that word (X) in the url
filetype:X	Return results which are a particular file extension X

Yandex

Query	Description
cache:X	Show cache of X
link:X	List webpages that have links pointing to URL X
site:X	Restrict the results to those websites in the given domain X
intitle:X	Restrict the results to documents containing that word (X) in the title
inurl:X	Restrict the results to documents containing that word (X) in the url
filetype:X	Return results which are a particular file extension X