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, (marijuana OR cannabis) AND (academic performance OR grades). The parentheses in this search clarify we still have 2 concepts, and both must be present. Please speak with a Reference Librarian if you need help combining search terms with Boolean operators.