  Based on the KP hierarchy reduction method, the general multi-dark soliton
solutions in Gram type determinant forms for the multi-component coupled
Maccari system are constructed. Especially, the three-component coupled Maccari
system comprised of two-component short waves and single-component long waves
are discussed in detail. Besides, the dynamics of one and two dark-dark
solitons are analyzed. It is shown that the collisions of two dark-dark
solitons are elastic by asymptotic analysis. Additionally, the two dark-dark
solitons bound states are studied through two different cases (stationary and
moving cases). The bound states can exist up to arbitrary order in the
stationary case, however, only two-soliton bound state exists in the moving
case. Besides, the oblique stationary bound state can be generated for all
possible combinations of nonlinearity coefficients consisted of positive,
negative and mixed cases. Nevertheless, the parallel stationary and the moving
bound states are only possible when nonlinearity coefficients take opposite
signs.
