inurl Example: inurl:admin
site Example:   site:yahoo.com
intitle intitle:hacking
allintitle   allintitle:hacking books
allinurl Example: allinurl: admin login
cache Example: cache: www.abc.com
numrange
filetype or ext Example: filetype:pdf    or  ext:pdf
link Example: link: yahoo.com
inanchor Example: inanchor:click
allintext Example: allintext: hacking world allintext
intext 
*
**
.
| Example: hello | world
+
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