PubMed is a great place to start, as it's one of the largest biomedical databases. It doesn’t use natural language like a web browser—instead, it relies on Medical Subject Headings (MeSH). Once a term matches a MeSH entry, the search stops and shows results for that term. Because many journal titles are also MeSH terms, they may not be searched correctly by default.
To find a journal title, use Advanced Search and set the field to "Journal."