Try entering a general search term, such as "biology" in the search bar. This will return a large number of results. Next, use the filters on the left side of the screen. With these filters, you will discover that the list of items for you to review becomes much more manageable.
For example, try filtering this way:
Subjects > Science > Earth Science
Grades > 2nd Grade
Tip: Give the "Type" filter a try. This filter lets you select the kind of resource that will be shown. Are you looking for a lesson? Are you looking for a book with great illustrations? Are you looking for a KWL chart? Use the "Type" filter to pick one of those. Filters like this will help you to find what you need and save you time in your search!