No. By default individual search keywords are connected with "AND". Your first search would only find files which contained all three words: "at" AND "good" AND "races". As you say, there's only one source which has all three words in the file name. You didn't mention the type of search you executed, but that source may be on another server, or there can be more reasons why that only one wasn't found.
If you want to search for files that contain either of the words, enter: at OR good OR races. You may build up more sophisticated earch expressions with the keywords AND, OR, NOT.