You can use ERIC to search specifically for empirical research - articles that report an actual experiment or study. To find research articles type in your search and then - using the "Publication Type" option in ERIC at the bottom of the search page - limit your search to the option "Reports - Research"
To focus your searches using ERIC try the following commands:
Another powerful technique is to search for your topic (keywords) in the title of articles. To do this change the dropdown menu in the Advanced Search from “Select a Field” to “TI Title”
For the following search example the phrase “problem based learning” must appear in the title of the article and math or mathematics or mathematical must appear in the abstract.
Before you search - you may wish to limit your search to “Scholarly (Peer Reviewed) Journals.”
To limit to “Scholarly (Peer Reviewed) Journals” be sure to check the box labeled “Scholarly (Peer Reviewed) Journals” farther down the search screen: