first I would have a look at http://wwwimages.adobe.com/content/dam/acom/en/legal/servicetou/Adobe-Stock-Additional-Ter ms_20160119.pdf
For your fields interest I found this e.g. Lizenzfreie Bilder, Fotos und Grafiken | Adobe Stock (sorry is in German language, but you will find the same in English.
If necessary and for further questions click through http://helpx.adobe.com/contact.html 'till you arrive at "chat". If "open" (there are opening hours) please use it, I for my part had the best experiences. I quote from Adobe's employee Preran: The chat button is activated as soon as there is an agent available to help.