When you enter your search, you will get results with that term in the paper's content (title, abstract, paper), the paper's author(s), and the paper's section. So, a search for Clinton will retrieve paper's both written by someone named Clinton and mentioning somone named Clinton (which may be the paper's subject, or may be a reference to another paper by an author named Clinton).
You can use query operators to restrict your search to certain fields. For example,
author:Gordon
section:"Political Psychology"
title:"electoral college"
Note that, by default, when your query contains multiple words or operators, results with any of the words or operators will be retrieved. If you want to narrow your search, you can use the AND operator; for example, Africa AND author:Kim