The existence of C-12 + O-16 molecular resonances at sub-barrier energy has been a significant problem in nuclear astrophysics because they strongly affect the C-12 + O-16 fusion reaction rate in type Ia supernovae and heavy stars. However, experimental surveys have been limited to 4 MeV and cannot access the deep sub-barrier energy due to a very small fusion cross section. Here we predict a couple of resonances with J(pi) = 0(+), 2(+), and 4(+) in the deep sub-barrier energy based on the antisymmetrized molecular dynamics calculation that reproduces the known resonances and low-lying spectrum of Si-28. (C) 2019 The Author(s). Published by Elsevier B.V.