Too few results means you'll need to consider trying...
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 upon. Generally the sources in the bibliography will be relevant to your topic--it is to your benefit to use them. The only problem with this is that works in the bibliography will be "older" than the article in hand.
You can also follow citations in the future, that is, those works that have cited your article AFTER it's been published by looking up who cited the work you have. Google Scholar is excellent for this. Paste your article title into Google Scholar; and click on the cited by link underneath the article title.