The primary database for finding journal articles in psychology is PsycNET.
In addition to the above databases, consider using databases from other disciplines when they are appropriate for your topic.
If your topic involves school-age children, consider the ERIC database.
Empirical research are studies based on actual and objective observation, experience or experimentation (original research).
Note: Other research articles that are not empirical might have similar elements; always read the article specially the methods or methodology section to distinguish if that study is an original research.