Be sure to access JSTOR through the Wolfgram A-Z Database, the ensures you have access the Full Text materials that we subscribe to.
You can put in phrases, keywords, authors or titles without any special formatting. This will give you a broader list of results that will, at least, allow you to peruse some options. If you're a more advanced searcher, you can put Boolean commands directly into the search bar or use the Advanced Search option. For additional help, check out JSTOR's "How to Search JSTOR" guide.
How it works
NOTE: You can upload or point to many kinds of text documents, including: csv, doc, docx, gif, htm, html, jpg, jpeg, json, pdf, png, pptx, rtf, tif (tiff), txt, xlsx. If the file type you're using isn't in this list, just cut and paste any amount of text into the search form to analyze it.