Are you using the German edition of 'Omikron: The Nomad Soul'? Are you stuck? A German site, RW Merchandising, is selling the hint book to the Nomad Soul, as well as items from other computer games.
To purchase the book, go to the link, here. Click on the menu item that says 'Losungbucher', then click on that same item on the next menu. You should see a list of available game titles, click on the 'Omikron: Nomad Soul' entry, and add the book to your shopping cart, then purchase the book.
All those using English versions, you can get yours here.
thanks to bianca