Stress-testing a patent in one’s portfolio is a common practice that allows the patent holder to assess the strength of a patent. By identifying weaknesses in a patent, a company may be able to avoid costly litigation and licensing fees.
Taking notes of keywords and search strings that yield relevant and irrelevant results may help in trial and error. You may also want to get all in-scope references by using very broad keywords and classifications but this may also result in a large number of references to review. Keywords that are too specific may result in high relevance but miss out on other references of interest.
It is also important to identify synonyms of important keywords to be able to expand the search and capture as many relevant references as possible. Some databases allow the use of search operators such as boolean and proximity operators.