DK1 = (C < MA (C, 21)) AND (Ref (C, -1) > MA (C, 21));

DK2 = C < 0.92* HHV (C, 22);

GiaLonNhat21 = HHV (C, 21);
GiaBeNhat21 = LLV (C,21);
DK3 = GiaLonNhat21 < 1.05*GiaBeNhat21;

TyLeTang = (C-Ref (C,-1))/Ref (C,-1);
DK4 = (TyLeTang < -0.03) AND (V > HHV (Ref(V, -1), 5));

Sell = DK1 OR DK2 OR DK3 OR DK4;

Filter = Sell;

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