  Starting from a realistic extended Hubbard model for a $p_{x,y}$-orbital
tight-binding model on the Honeycomb lattice, we perform a thorough
investigation on the possible electron instabilities in the MA-TBG near the van
Hove (VH) dopings. Here we focus on the interplay between the approximate
SU(2)$\times$SU(2) symmetry and the $D_3$ symmetry, which leads to intriguing
quantum states relevant to recent experiments, as revealed by our systematic
RPA based calculations followed by a succeeding mean-field energy minimization
for the ground state energy. At the SU(2)$\times$SU(2) symmetric point, the
degenerate inter-valley SDW and VDW are mixed into a new state of matter dubbed
as the chiral SO(4) spin-valley DW. This state simultaneously hosts three
4-component vectorial spin-valley DW orders with each adopting one wave vector,
and the polarization directions of the three DW orders are mutually
perpendicular to one another. %in the $\mathbb{R}^4$ space. In the presence of
a tiny inter-valley exchange interaction with coefficient $J_H\to 0^{-}$ which
breaks the SU(2)$\times$SU(2) symmetry, a pure chiral SDW state is obtained. In
the case of $J_H\to 0^{+}$, a nematic VDW+SDW state emerges which possesses a
stripy distribution of the charge density, consistent with the recent STM
observations. On the aspect of SC, while the triplet $p+ip$ and singlet $d+id$
topological SCs are degenerate at $J_H=0$ near the VH dopings, the former
(latter) is favored for $J_H\to 0^{-}$ ($J_H\to 0^{+}$). In addition, the two
asymmetric doping-dependent behaviors of the obtained pairing phase diagram are
well consistent with experiments.
