  We report a search for the decays $B^{0} \to D_{s}^{-} D_{s}^{+}$, $B^{0} \to
D_{s}^{*-} D_{s}^{+}$, $B^{0} \to D_{s}^{*-} D_{s}^{*+}$ in a sample of 232
million $\Upsilon(4S)$ decays to \BBb ~pairs collected with the \babar detector
at the PEP-II asymmetric-energy $e^+ e^-$ storage ring. We find no significant
signal and set upper bounds for the branching fractions: ${\cal B}(B^{0} \to
D_{s}^{-} D_{s}^{+}) < 1.0 \times 10^{-4}, {\cal B}(B^{0} \to D_{s}^{*-}
D_{s}^{+}) < 1.3 \times 10^{-4}$ and ${\cal B}(B^{0} \to D_{s}^{*-} D_{s}^{*+})
< 2.4 \times 10^{-4}$ at 90% confidence level.
