  We have searched for the decays $B^0 \rightarrow D_s^{+}a_0^-$, $B^0
\rightarrow D_s^{*+}a_0^-$, $B^0 \rightarrow D_s^{+}a_2^-$ and $B^0 \rightarrow
D_s^{*+}a_2^-$ in a sample of about 230 million $\Upsilon(4S) \rightarrow
B{\bar B}$ decays collected with the {\sl BaBar} detector at the PEP-II
asymmetric-energy $B$-factory at SLAC. We find no evidence for these decays and
set upper limits at 90\% C.L. on the branching fractions: ${\cal B}(B^0
\rightarrow D_s^+ a_0^-) < 1.9\times 10^{-5}$, ${\cal B}(B^0 \rightarrow
D_s^{*+} a_0^-) < 3.6\times 10^{-5}$, ${\cal B}(B^0 \rightarrow D_s^+ a_2^-) <
1.9 \times 10^{-4}$, and ${\cal B}(B^0 \rightarrow D_s^{*+} a_2^-) < 2.0\times
10^{-4} $.
