7. The method as in claim 6 , where establishing the DCM includes operating a term extraction tool to locate sets of individual keywords and keyword combinations comprising locating, in order, individual keywords that are found in only one domain, double-keyword combinations that are found in the only one domain, and triple-keyword combinations that are found in the only one domain, where the locating ends when one of, no larger keyword combinations can be located or a predetermined threshold is reached, and operating a search engine to index the located keywords and keyword combinations as at least one entry in the DCM index.
6. The method of claim 1 further comprising: clustering the search results by the domain or domains that are searched; and displaying the clustered search results to the user.