You are using a smaller version of PubMatch. The actual LSI model I've created costs too much right now to host myself. If you'd like the model so you can try it out locally on your computer OR if you're interested in using a tool like this and would be willing to pay for it please email firstname.lastname@example.org.
PUBmatch finds conceptually similar articles for a given document using a technique called Latent Semantic Indexing. The longer your document the more narrowed your search will become.
You could use this to find pubmed articles based on correspondence between a doctor and patient or on information you find from news articles on the web.
Simply paste the text in this window and press Find Articles