There are many ways to find what you need.
Probably the easiest way is to use the search form in the left menu.
You find it by clicking in "Icons"
Just type in what you need and a drop-down menu will suggest you some images based on the available illustrations. Hit "Enter" to search.
You may also search using our proposed "Categories".
Click the drop-down menu below the search field to see the available illustrations.
Many more are added regularly and you can also request customized illustrations.