To find the most relevant items, use a Keyword search to identify several relevant Subject Headings. For instance, a Keyword search for "positive psychology" (including the quotation marks to search the two words as an exact phrase) yielded these Library of Congress subject headings:
Note the special linking in subject headings:
One of the major components of your grade in this class is a research project. The resources provided here will help you complete your research.
I recommend a few strategies to start:
Look for subject headings, descriptors, etc. in item records that match your topic to zero in on that database's terms
Think about the topic of the database: don't need to search "health" in PubMed.