EconLit and JStor are the primary sources for locating research articles covering Economics topics. On JStor, you can first select Economics collection, then browse the results by searching your keywords in the "Abstract" field(s). Because Jstor is a full-text database, narrowing your search in the Abstract field is most efficient. If searching the keyword in the Abstract field is not successful, search default, with which you will conduct a broader search including full-text contents.
Research Papers in Economics is an open-access alternative.
Canadian Centre for Policy Alternatives
Reports & Studies, Commentary, and Fact Sheets & Infographics