For each citation, PubMed provides a link to Similar articles. By default, it provides five articles, but you can expand the list to Show more or See all.
The filters you selected for your primary search will be retained when viewing similar articles. Clear the filters to expand the search even further.
When the citation you're viewing has been cited by others, you can follow the citation trail to locate other articles on the subject.
To expand your results using Boolean operators, try adding synonyms/related terms with OR (in capital letters): for example, exercise (anxiety OR depression). The parentheses in this search clarify that you’re looking for articles about exercise that also discuss anxiety or depression. Without the parentheses, PubMed would look for articles about exercise and anxiety OR articles about depression (an extremely broad search). Please speak with a Reference Librarian if you need help combining search terms with Boolean operators.