Perhaps you should try some spelling variations:
"Механика сложных сред" » "Механика сложных среда" (Expand Search), "Механика сложных ред" (Expand Search)
"Механика сплошных среды" » "Механика сплошных средаы" (Expand Search), "Механика сплошных реды" (Expand Search)
"Механика сплошных средаы" » "Механика сплошных средааы" (Expand Search), "Механика сплошных редаы" (Expand Search), "Механика сплошных среда" (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("Механика сложных сред") OR ((("Механика сплошных среды") OR ("Механика сплошных средаы"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"Механика сложных сред\") OR (((\"Механика сплошных среды\") OR (\"Механика сплошных средаы\"))))*".
• Removing quotes may allow a broader search: (( Механика сложных сред ) OR ((( Механика сплошных среды ) OR ( Механика сплошных средаы ))))*.