  We report the detection of four new hot corino sources, G211.47-19.27S,
G208.68-19.20N1, G210.49-19.79W and G192.12-11.10 from a survey study of Planck
Galactic Cold Clumps in the Orion Molecular Cloud Complex with the Atacama
Compact Array (ACA). Three sources had been identified as low mass Class 0
protostars in the Herschel Orion Protostar Survey (HOPS). One source in the
lambda Orionis region is firstly reported as a protostellar core. We have
observed abundant complex organic molecules (COMs), primarily methanol but also
other oxygen-bearing COMs (in G211.47-19.27S and G208.68-19.20N1) and the
molecule of prebiotic interest NH2CHO (in G211.47-19.27S), signifying the
presence of hot corinos. While our spatial resolution is not sufficient for
resolving most of the molecular emission structure, the large linewidth and
high rotational temperature of COMs suggest that they likely reside in the
hotter and innermost region immediately surrounding the protostar. In
G211.47-19.27S, the D/H ratio of methanol ([CH2DOH]/[CH3OH]) and the 12C/13C
ratio of methanol ([CH3OH]/[13CH3OH]) are comparable to those of other hot
corinos. Hydrocarbons and long carbon-chain molecules such as c-C3H2 and HCCCN
are also detected in the four sources, likely tracing the outer and cooler
molecular envelopes.
