When searching for scientific articles, be as specific as possible. (Once you have an idea of your search terms).
STEP 1: try several general search terms
STEP 2: Review your keywords.
STEP 3: Review the results lists
STEP 4: Review some abstracts of articles that seem to be close or on target, then review the Reference list (bread crumbs).
Keep a list of searches/words that worked, and which databases you used for those search terms.