You can browse across the tree. When you click on some node name (term) you see information dealing with related term described in the node of tree.  If you click on the arrow on the right of node name, you can see subnodes of the node (set terms related to the main term).

Another possibility is to search across the tree. You just need to write some first letters of required term. If written letters are in the beginning of some word in the node name (term) you will see all occurrences of the term in the tree. 

Examples: 
     fin for fine, fines
     right for right or rights ...
     scien for science, scientific
     transf for transer, transfering
     arch for archive, archiving

Special search is for definitions - some of them are also across whole document treaty. Write definition in search box and all definitions across the Regulation will be listed.

Click on X on the right of the search field finishes search.