  The amplitudes for decays of the type $B_{d,s} \to D_{s,d} D_{s,d}$, have no
factorizable contributions, while $B_{d,s} \to D_{s,d} D^*_{s,d}$, and $B_{d,s}
\to D^*_{s,d} D^*_{s,d}$ have relatively small factorizable contributions
through the annihilation mechanism. The dominant contributions to the decay
amplitudes arise from chiral loop contributions and tree level amplitudes which
can be obtained in terms of soft gluon emissions forming a gluon condensate. We
predict that the branching ratios for the processes $\bar B^0_d \to D_s^+
D_s^-$,
  $\bar B^0_d \to D_s^{+*} D_s^- $ and $\bar B^0_d \to D_s^+ D_s^{-*}$ are all
of order $(2- 3) \times 10^{-4}$, while $\bar B^0_s \to D_d^+ D_d^-$,
  $\bar B^0_s \to D_d^{+*} D_d^- $ and $\bar B^0_s \to D_d^+ D_d^{-*}$ are of
order $(4- 7) \times 10^{-3}$. We obtain branching ratios for two $D^*$'s in
the final state of order two times bigger.
