The text you provided is a transliterated/encoded version of the Russian phrase: , which translates to "Secret Spells of the Sages" or "Secret Sage Spells" .
If you are not referring to the Sims 4 mod, this phrase appears in other gaming contexts:
The mod unlocks hidden spells that are normally exclusive to the NPC Sages in the game. These spells include:
: To learn these spells, your Sim typically needs: To be Rank 5 (Virtuoso) in spellcasting.
To have the specific unlocked (e.g., "Tame the Untameable" for Untamed Magic). A high friendship level with the Sage of that school.
: Adds 11 new spells to the spellbook, often grouped under three main categories.