Defining your search strategy for TechDiscovery
The more information that is input to your search, the more specific the returned similar patents will be, for instance if you input patent numbers and a few keywords, you'll not only retrieve the actual patents for reading and similar patents to these, you'll also retrieve patents based on the keywords that have been input. All retrieved patents will be sorted based on a similarity score based on both pieces of information input.
As a starting point any few keywords on the topic are good. For further refinement of the results, it helps to select relevant and irrelevant patents and update the results based on the selection.