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

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("drevnii i srednevekovye istochniki x etnografii i istorii narodov afriki iuzhnee sakhary.") or ("drevnie i srednevekovye istochniki vii etnografii i istorii narodov amriki iuzhnee sakhary."))) or ("drevnie i srednevekovye istochniki po etnografii _ histories narodov afriki iuzhnee sakhary."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("drevnii i srednevekovye istochniki x etnografii i istorii narodov afriki iuzhnee sakhary.") OR ("drevnie i srednevekovye istochniki vii etnografii i istorii narodov amriki iuzhnee sakhary."))) OR ("drevnie i srednevekovye istochniki po etnografii _ histories narodov afriki iuzhnee sakhary.")).
• Removing quotes may allow a broader search: (((( drevnii i srednevekovye istochniki x etnografii i istorii narodov afriki iuzhnee sakhary. ) or ( drevnie i srednevekovye istochniki vii etnografii i istorii narodov amriki iuzhnee sakhary. ))) or ( drevnie i srednevekovye istochniki po etnografii _ histories narodov afriki iuzhnee sakhary. )).
• Adding a wildcard symbol may retrieve word variants: (((("drevnii i srednevekovye istochniki x etnografii i istorii narodov afriki iuzhnee sakhary.") or ("drevnie i srednevekovye istochniki vii etnografii i istorii narodov amriki iuzhnee sakhary."))) or ("drevnie i srednevekovye istochniki po etnografii _ histories narodov afriki iuzhnee sakhary."))*.