What pages are in the search index
To find out how many pages the robot indexes, which of them got into the search results and which did not, you can register in Yandex.Webmaster service that provides more detailed information on site indexing.
Please note that in some cases the pages may not be shown in search results for some time, even though they are indexed.
To obtain more details (e.g. to find out exactly which subdomains of your site are indexed), use the query language operators host or rhost.