Some German words just cannot be hyphenated properly by the package. Especially those that consists actually of two or more words. For these words use:

\hyphenation{Ele-men-tar-ob-jek-te Op-ti-mie-rungs-pro-blem} 

Seperate the words with a space character, like in the example.

Edit:

A full example:

\documentclass[12pt,a4paper]{report} \usepackage{amsmath} \usepackage{amsthm} \usepackage{fancyhdr} \usepackage{titlesec} \usepackage[utf8]{inputenc} \usepackage{hyphsubst} \usepackage[ngerman]{babel} \hyphenation{Ele-men-tar-ob-jek-te Op-ti-mie-rungs-pro-blem} \begin{document} Text of my document... \end{document} 

Some German words just cannot be hyphenated properly by the package. Especially those that consists actually of two or more words. For these words use:

\hyphenation{Ele-men-tar-ob-jek-te Op-ti-mie-rungs-pro-blem} 

Seperate the words with a space character, like in the example.

Edit 1:

A full example:

\documentclass[12pt,a4paper]{report} \usepackage{amsmath} \usepackage{amsthm} \usepackage{fancyhdr} \usepackage{titlesec} \usepackage[utf8]{inputenc} \usepackage{hyphsubst} \usepackage[ngerman]{babel} \hyphenation{Ele-men-tar-ob-jek-te Op-ti-mie-rungs-pro-blem} \begin{document} Text of my document... \end{document} 

Edit 2:

See here. Sorry, it's German, but it's meant to help the author.

Some German words just cannot be hyphenated properly by the package. Especially those that consists actually of two or more words. For these words use:

\hyphenation{Ele-men-tar-ob-jek-te Op-ti-mie-rungs-pro-blem} 

Seperate the words with a space character, like in the example.

Some German words just cannot be hyphenated properly by the package. Especially those that consists actually of two or more words. For these words use:

\hyphenation{Ele-men-tar-ob-jek-te Op-ti-mie-rungs-pro-blem} 

Seperate the words with a space character, like in the example.

Edit:

A full example:

\documentclass[12pt,a4paper]{report} \usepackage{amsmath} \usepackage{amsthm} \usepackage{fancyhdr} \usepackage{titlesec} \usepackage[utf8]{inputenc} \usepackage{hyphsubst} \usepackage[ngerman]{babel} \hyphenation{Ele-men-tar-ob-jek-te Op-ti-mie-rungs-pro-blem} \begin{document} Text of my document... \end{document}