Usually, keywords don't contain punctuation (auto-generated keywords never will). When a word containing punctuation (unquoted) is entered in a quick search, UR actually breaks the search into separate keyword searches ('a' and 'c' in this case), but since there typically will be no keywords shorter than 2 characters long, there are no matches. Placing the value in double quotes causes UR to not split the search text on punctuation characters.
BTW, it still does perform an indexed search with the keyword in quotes (click the Advanced button to see what sort of search is actually being performed).
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