Most of the content in Academic Search Premier is articles. If you want to limit your results to just articles from academic journals, check the "Limit to Scholarly (Peer Review) Journals" box on the left hand side after performing a search. In the same spot, you will find other options to allow you to narrow your search.
We recommend that you break your query up into separate concepts/keywords, and type each keyword/concept into separate search box at the top. You can find more information on identifying keywords to help you find the results you want on our Keywords guide.