SSRN's quick search looks for words in the author, title, or abstract of a paper. This search is available throughout SSRN.
Search box on SSRN's homepage
Search box on the top of most SSRN pages.
If you want to search for a phrase, use quotation marks: "equal protection".
In Advanced Search, you can:
Use the Date menu to limit your search to papers posted within a recent period (from the last week to the last three years). (Note that papers that were written many years ago might have been posted recently.)
In Advanced Search, you can also limit your search to one or more SSRN Networks.
For example, searching only the Legal Scholarship Network for "cost benefit" gets only about half as many papers as searching all the networks, including those for economics, management, and political science.
Sometimes you'll want the cross-discipline breadth you get by searching all the networks. Other times, you will like the ability to choose networks..