  Assuming that $D_{s0}^{*}(2317)$ is a $DK$ molecular state with a binding
energy of 45 MeV, we investigate the existence of four-hadron molecules, $DDKK$
and $D\Bar{D}K\Bar{K}$, with the Gaussian expansion method. Their binding
energies are $138\sim155$ MeV and $123\sim163$ MeV below the mass thresholds of
$DDKK$ and $D\Bar{D}K\Bar{K}$. The $D\Bar{D}K\Bar{K}$ state has a decay width
of $36\sim54$ MeV due to the complex $K\Bar{K}$ interaction. Further
theoretical studies of and experimental searches for such four-hadron molecules
can help deepen the understanding of the nonperturbative strong interaction in
a nontrivial way.
