Perhaps you should try some spelling variations:
"drevnii i srednevekovye istochniki po etnografii i istorii narodov afriki iuzhnee sakhary." » "drevnii i srednevekovye istochniki x etnografii i istorii narodov afriki iuzhnee sakhary." (Expand Search), "drevnii i srednevekovye istochniki vii etnografii i istorii narodov afriki iuzhnee sakhary." (Expand Search), "drevnii mir srednevekovye istochniki po etnografii i istorii narodov afriki iuzhnee sakhary." (Expand Search), "drevnii i srednevekovye istochniki po etnografii i historia narodov afriki iuzhnee sakhary." (Expand Search), "drevnii i srednevekovye istochniki po etnografii i historie narodov afriki iuzhnee sakhary." (Expand Search), "drevnii i srednevekovye istochniki po etnografii i istorii narodov afrika iuzhnee sakhary." (Expand Search), "drevnii i srednevekovye istochniki po etnografii i istorii narodov amriki iuzhnee 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), "drevnie i srednevekovye istochniki vii etnografii i istorii narodov afriki iuzhnee sakhary." (Expand Search), "drevnie i srednevekovye istochniki po etnografii i historia 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)
"drevnie i srednevekovye istochniki po etnografii i historic narodov afriki iuzhnee sakhary." » "drevnie i srednevekovye istochniki x etnografii i historic narodov afriki iuzhnee sakhary." (Expand Search), "drevnie i srednevekovye istochniki vii etnografii i historic narodov afriki iuzhnee sakhary." (Expand Search), "drevnie i srednevekovye istochniki po etnografii _ historic narodov afriki iuzhnee sakhary." (Expand Search), "drevnie i srednevekovye istochniki po etnografii a historic narodov afriki iuzhnee sakhary." (Expand Search), "drevnie i srednevekovye istochniki po etnografii 4 historic narodov afriki iuzhnee sakhary." (Expand Search), "drevnie i srednevekovye istochniki po etnografii i historic narodov afrika iuzhnee sakhary." (Expand Search), "drevnie i srednevekovye istochniki po etnografii i historic narodov amriki iuzhnee sakhary." (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("drevnii i srednevekovye istochniki po etnografii i istorii narodov afriki iuzhnee sakhary.") or ((("drevnie i srednevekovye istochniki po etnografii i istorii narodov afriki iuzhnee sakhary.") OR ("drevnie i srednevekovye istochniki po etnografii i historic narodov afriki iuzhnee sakhary."))))~.
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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"drevnii i srednevekovye istochniki po etnografii i istorii narodov afriki iuzhnee sakhary.\") or (((\"drevnie i srednevekovye istochniki po etnografii i istorii narodov afriki iuzhnee sakhary.\") OR (\"drevnie i srednevekovye istochniki po etnografii i historic narodov afriki iuzhnee sakhary.\"))))".
• Removing quotes may allow a broader search: (( drevnii i srednevekovye istochniki po etnografii i istorii narodov afriki iuzhnee sakhary. ) or ((( drevnie i srednevekovye istochniki po etnografii i istorii narodov afriki iuzhnee sakhary. ) OR ( drevnie i srednevekovye istochniki po etnografii i historic narodov afriki iuzhnee sakhary. )))).
• Adding a wildcard symbol may retrieve word variants: (("drevnii i srednevekovye istochniki po etnografii i istorii narodov afriki iuzhnee sakhary.") or ((("drevnie i srednevekovye istochniki po etnografii i istorii narodov afriki iuzhnee sakhary.") OR ("drevnie i srednevekovye istochniki po etnografii i historic narodov afriki iuzhnee sakhary."))))*.