By default, the Basic Search page is displayed, where the search words are searched in the title, authors, keywords, subjects and abstract. You can use Boolean operators, proximity operators and truncation. You can also limit the basic search to only search from titles and authors.

The Advanced Search option allows you to choose multiple fields at the same time, such as All text, Author, Title, Subject, Journal title, Abstract. You can combine search words on different fields by using Boolean operators AND, OR and NOT.    

If  you do not change the default selection Select a field (optional), all fields are searched excluding the full texts of the articles.

Under Search Options you can choose Search modes and limit and expand the search.