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I tried using site:.pdf for finding websites ending with .pdf but it did not showed up anything. If I would have googled "free pdf books" etc it shows up pdf results. Why doesn't it show up the my query?

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Because site: operator works for TLDs and .pdf is not a tld. It's a file type. use the filetype: operator to search for pdf files. E.g. -

origin of species filetype:pdf

Results -

Google results

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Filetype does not work for me. – Fahad Uddin Apr 30 '12 at 11:44
filetype, not Filetype. – Bibhas Apr 30 '12 at 12:00
google filetype:.html shows up no results. – Fahad Uddin Apr 30 '12 at 12:05
Read the answer carefully. see what you're doing wrong. yeah, your query is wrong. – Bibhas Apr 30 '12 at 12:57
this is the right answer. You can't include the . in the search query. – Dez Apr 30 '12 at 13:20

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