If you enter one search term at a time into the search box, you will see that Emtree terms appear below the box. You can accept (by clicking them) or not. When you do accept the Emtree term, the word(s) will appear in the search box within single quote marks.
Note also that there are some default settings underneath the search box. "Search as broadly as possible" is checked; this means that Embase will search for results through both keywords & Emtree terms. Uncheck this box if you need to narrow your search to citations that are indexed only.
Below that is one of the places where you can set a publication date limit. Either accept "all years" by doing nothing or uncheck that box & add the years of your choice from the dropdown lists.