You can use citations listed in a reference list of a relevant article to find additional useful articles (tracing backward for earlier articles). For example, this article:
Liu, K., Duan, Y., & Wang, Y. (2021). The effectiveness of a web-based positive psychology intervention in enhancing college students’ mental well-being. Social Behavior and Personality: An International Journal, 49(8), 1–13. https://doi.org/10.2224/sbp.10459
cites in its bibliography the following article:
To locate an article, search for the title in the search box on the library's homepage. Use Interlibrary Loan if we don't have it.
If you find a relevant article that is too old, you can find out what newer articles cited it, using Google Scholar (tracing forward) since a citing article is often about a similar topic. For example:
Click on the "Cited by" to see newer articles that cite this article, then you can search within those to find the most relevant articles: