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For example: when searching the word "йӹлмӹ" with the following request to Special:Search, I cannot find a single page:

http://mrj.wikipedia.org/w/index.php?title=%D0%A1%D0%BF%D0%B5%D1%86%D3%B9%D0%BB%D3%B9%D1%88%D1%82%D3%93%D1%88:Search&redirs=1&search=%D0%B9%D3%B9%D0%BB%D0%BC%D3%B9&fulltext=Search&ns0=1&ns1=1&ns2=1&ns3=1&ns4=1&ns5=1&ns6=1&ns7=1&ns8=1&ns9=1&ns10=1&ns11=1&ns12=1&ns13=1&ns14=1&ns15=1&title=%D0%A1%D0%BF%D0%B5%D1%86%D3%B9%D0%BB%D3%B9%D1%88%D1%82%D3%93%D1%88:Search&advanced=1&fulltext=Advanced+search

But with Google I can find several pages:

http://www.google.ru/#sclient=psy&hl=ru&q=%D0%B9%D3%B9%D0%BB%D0%BC%D3%B9+site:mrj.wikipedia.org&aq=f&aqi=&aql=&oq=&gs_rfai=&pbx=1&fp=c6f81ec5d6944d18

*** This bug has been marked as a duplicate of bug 25682 ***