convert pdf(chinese language) to doc, appear messy code

I use docker image in mac system
Dockerfile:

FROM centos

RUN yum install -y libreoffice-writer.x86_64
RUN yum groupinstall -y "Fonts" "Input Methods"

CMD ["/bin/bash"]

start docker:

docker run -it -v `pwd`:/root/  libreoffice_main /bin/bash

and run the command:

soffice --invisible --convert-to doc a.pdf

a.pdf:

after convert get a.doc:

Have you tried this operation in interactive mode? and how?

See e.g. this for correct syntax converting to a text document. The reason: by default, PDFs are imported as drawing documents, and after they have been imported as such, they can only be exported as (other) drawing documents. To export as text document, you need to import as text document first.