Google dorks

Basic

Domain related search:

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site:example.org

Excluding sub domains:

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site:example.org -site:www.example.org

Example of search in title, in URL and exclude a file type:

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intitle:"netbotz appliance" "OK" -filetype:pdf
intitle:"SpeedStream Router Management Interface"
inurl:"level/15/exec/-/show"
"# -FrontPage-" filetype:pwd inurl:(services|authors|administrators|users)

GHDB

Google Hacking Database