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Using site specific search operator in Google, Yahoo, Baidu, Bing, Seznam

To restrict your search for a specific website (let’s say to search for Helen Hunt from wikipedia website) in Google, Yahoo, Baidu, Bing,Soso, Sogou and Seznam you need to use site: operator
For example the search for site:wikipedia.org helen hunt
will return pages from all wikipedia sites for the key phrase Helen Hunt (BTW she is my favorite), take a look at the snapshot

Google has returned top ten pages from wikipedia sites for “Helen Hunt”, You can also notice in the snapshot that there are pages from en.wikipedia.org pages as well as from simple.wikipedia.org, you can restrict search to a specific sub domain by exactly typing in the url after site operator as in “site:en.wikipedia.org helen hunt“. Even better refining of results is possible by restricting search to a specific folder of the site Eg:en.wikipedia.org/wiki helen hunt

You can also use site: operator in broader sense, instead of just limiting search to a specific site, we can restrict site to .edu, .org, .com and other top level domains Eg: site:edu mit

Seznam is different and good in someway, It returns results of the forms example.com/cs/page/1/ and example.com/page/1/cs/ when you search for site:example.com/cs/

Yahoo redirects us to siteexplorer.search.yahoo.com when site: operator is used, we can directly go to siteexplorer.search.yahoo.com and type in the site url instead of site operator.

Yandex doesn’t support site operator as I know, It only returns the main page as of now, but if you are a webmaster and wondering how to know which of the pages are added to yandex try adding your site to Yandex webmaster tools at webmaster.yandex.ru and search inside your webmaster tools (http://webmaster.yandex.ru/site/indexed-pages.xml?host=xxxxx&path=*) by just typing in the sitename followed by * Eg: example.com/* will return all example.com pages
Note: XXXXX in the url is the id of your site that yandex has assigned (only if have submitted your site to yandex)