A great way to find articles on your topic is to look at the reference list of a relevant article you have already found. Articles cited by an author are often closely related to the same topic.
Using PsycINFO, you can find related articles by looking for the Cited References and Times Cited in this Database links on an article record specifically.
Using Google Scholar, look for the Cited by link below the title and description. Related Articles will also retrieve related articles. Usually the first few articles retrieved with the Related Articles function will be the most strongly related (results may vary).