Avoid page break between section title and included subsections

Question

When I apply the following code, I have a page break between the \section{*} and the \include{chapters/*.tex} (the chapters are composed of subsection). I would like to have no page break between the section title and the subsection title.

\documentclass{article}
\usepackage{hcmut-report}
\usepackage{codespace}
\usepackage{xcolor,amsmath,amssymb,gensymb,textcomp}
\usepackage{array,multicol,multirow,siunitx,tabularx}
\usepackage{enumitem}
\usepackage{caption,float}
\usepackage[export]{adjustbox}
\usepackage{mwe}
% Custom commands
% Remove if unneeded
\newcommand*\mean[1]{\bar{#1}}
\ocoursename{}
\oreporttype{}
\title{}
\oauteurs{}
\reportlayout%
\begin{document}
\coverpage%
\tableofcontents
\listoffigures
\listoftables
\newpage
\section{Site d'étude}
\include{chapters/Site.tex}
\section{Hydrologie}
\include{chapters/Hydrologie.tex}
\bibliographystyle{plain}
\bibliography{refs}
\nocite{*}
\end{document}

I have also a cover page, but I guess it is not necessary to add the code here.