\documentclass{article}

\usepackage{geometry}
\usepackage[dutch]{babel}
\usepackage{parskip}
\usepackage{amsmath,amssymb}
\usepackage{graphicx,subcaption}
\usepackage{xcolor}
\usepackage{adjustbox}

\geometry{
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\begin{document}

\"e, \'e, \^e, \H{a}

\"F\textsl{\H{a}nc}\^{\i}\~ne\c{s}s

\end{document}