Perhaps you should try some spelling variations:
"Drevnie i srednevekovye istochniki vii ėtnografii i istorii narodov Afriki ︠i︡uzhnee Sakhary." » "Drevnie i srednevekovye istochniki x ėtnografii i istorii narodov Afriki ︠i︡uzhnee Sakhary." (Expand Search), "Drevnie i srednevekovye istochniki vii ėtnografii i historic narodov Afriki ︠i︡uzhnee Sakhary." (Expand Search), "Drevnie i srednevekovye istochniki vii ėtnografii i historie narodov Afriki ︠i︡uzhnee Sakhary." (Expand Search)
"Drevnie i srednevekovye istochniki vii ėtnografii i historia narodov Afriki ︠i︡uzhnee Sakhary." » "Drevnie i srednevekovye istochniki x ėtnografii i historia narodov Afriki ︠i︡uzhnee Sakhary." (Expand Search), "Drevnie i srednevekovye istochniki vii ėtnografii _ historia narodov Afriki ︠i︡uzhnee Sakhary." (Expand Search), "Drevnie i srednevekovye istochniki vii ėtnografii his historia narodov Afriki ︠i︡uzhnee Sakhary." (Expand Search), "Drevnie i srednevekovye istochniki vii ėtnografii i historical narodov Afriki ︠i︡uzhnee Sakhary." (Expand Search)
"drevnie i srednevekovye istochniki po etnografii i istorii narodov afriki iuzhnee sakhary." » "drevnie i srednevekovye istochniki x etnografii i istorii narodov afriki iuzhnee sakhary." (Expand Search), "drevnii i srednevekovye istochniki po etnografii i istorii narodov afriki iuzhnee sakhary." (Expand Search), "drevnie i srednevekovye istochniki po etnografii i historic narodov afriki iuzhnee sakhary." (Expand Search), "drevnie i srednevekovye istochniki po etnografii i historie narodov afriki iuzhnee sakhary." (Expand Search), "drevnie i srednevekovye istochniki po etnografii i istorii narodov afrika iuzhnee sakhary." (Expand Search), "drevnie i srednevekovye istochniki po etnografii i istorii narodov amriki iuzhnee sakhary." (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("Drevnie i srednevekovye istochniki vii ėtnografii i istorii narodov Afriki ︠i︡uzhnee Sakhary.") OR ("Drevnie i srednevekovye istochniki vii ėtnografii i historia narodov Afriki ︠i︡uzhnee Sakhary."))) or ("drevnie i srednevekovye istochniki po etnografii i istorii narodov afriki iuzhnee sakhary."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("Drevnie i srednevekovye istochniki vii ėtnografii i istorii narodov Afriki ︠i︡uzhnee Sakhary.") OR ("Drevnie i srednevekovye istochniki vii ėtnografii i historia narodov Afriki ︠i︡uzhnee Sakhary."))) OR ("drevnie i srednevekovye istochniki po etnografii i istorii narodov afriki iuzhnee sakhary.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"Drevnie i srednevekovye istochniki vii ėtnografii i istorii narodov Afriki ︠i︡uzhnee Sakhary.\") OR (\"Drevnie i srednevekovye istochniki vii ėtnografii i historia narodov Afriki ︠i︡uzhnee Sakhary.\"))) or (\"drevnie i srednevekovye istochniki po etnografii i istorii narodov afriki iuzhnee sakhary.\"))".
• Removing quotes may allow a broader search: (((( Drevnie i srednevekovye istochniki vii ėtnografii i istorii narodov Afriki ︠i︡uzhnee Sakhary. ) OR ( Drevnie i srednevekovye istochniki vii ėtnografii i historia narodov Afriki ︠i︡uzhnee Sakhary. ))) or ( drevnie i srednevekovye istochniki po etnografii i istorii narodov afriki iuzhnee sakhary. )).
• Adding a wildcard symbol may retrieve word variants: (((("Drevnie i srednevekovye istochniki vii ėtnografii i istorii narodov Afriki ︠i︡uzhnee Sakhary.") OR ("Drevnie i srednevekovye istochniki vii ėtnografii i historia narodov Afriki ︠i︡uzhnee Sakhary."))) or ("drevnie i srednevekovye istochniki po etnografii i istorii narodov afriki iuzhnee sakhary."))*.