If you've simply picked a topic that's too broad, you may need to choose something more focused. See Broadening/Narrowing Your Topic.
Try adding more search terms to narrow down the results.
See Search Techniques.
Sometimes just choosing the right sort will cause the articles you want to rise to the top of the list, or will group like things together. Common options include:
If you've picked a topic that's too narrow, you may need to expand the scope of your paper. See Broadening/Narrowing Your Topic.
See Search Techniques and Search Terms.
If the database uses Boolean operators, try combining terms with or instead of and.
As long as you find one good scholarly article or book, you can look up the works cited in the footnotes or bibliography to find the sources it's based on.
You can also follow citations forward in time by looking up who cited the work you have. Web of Science has cited reference searches.