After your search, the results page will show how many hits you received from the initial search. As you can see the original search for "South America" AND agriculture returned over 40,000 results.
With over 40,000 hits you will want to narrow the results. An easy way to do this is with the Filters under the search box at the top of the page. Click the box next to the filter you want to use and the database will automatically update.
Use the Subject: Thesaurus Term to narrow even further. Click on the Show More link to expand list with more options.
Did you narrow your results too much? You can always go back by clicking an X next to a filter to undo it by clicking on the filters option found underneath the search box. *Note: all filters will be displayed underneath the search box (refer to first screenshot below)*
