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when you do a search with search.php or the textbox in the block. you are doing a search through all the modules, including the isearch module. it is this that makes it so these keywords are recorded. the search function in isearch stores the keywords that were queried.
the function is isearch_search in modules/isearch/include/search.inc.php
when you do an EXACT search the whole string becomes the keyword (the script doesn't separate it). you could modify the isearch_search function to check if $queryarray is an array and if it is not then break it up with,(example from search.php) preg_split('/[\s,]+/', $query); , and the rest of the function will take care of the rest.
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