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:
If you are hitting a paywall when trying to read an article...
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.