User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.0.04506) Build Identifier: v3.2.2 - stable When a defect summary contains the word 'MAC', it will not pop-up in the search results when searching for this specific word. Searching for other words in the same summary does work fine. Analysis: It seems that when the title refers (partially) to an OS it skips these defects when searching for this particular word. Besides MAC, I confirmed this applies as well to 'Linux'. Example: a defect exists with summary: "CM MAC bla" When performing a search on MAC on the above defect, Bugzilla will not find it. Reproducible: Always Steps to Reproduce: Precondition: Defect exists with a title as mentioned above Steps: 1.Enter CM in the search box and see if it is returned in the results 2.Enter bla in the search box and see if it is returned in the results 3.Enter MAC in the search box and see if it is returned in the results Actual Results: 1.OK - the defect is listed 2.OK - the defect is listed 3.NOK - the defect is not listed Expected Results: The defect is listed on all 3 occasions. I actually assume this problem is already reported, but I couldn't find it after several searches... If it turns out to be a duplicate, please reject it.
Advanced Search is able to find it. When you use the Specific Search, it probably ignores MAC because this word is either too common and rejected by MySQL's fulltext search engine, or because this word is in the stopwords list of MySQL.
Oh, and looking for "Linux" works fine. Bugs are correctly reported, so it's unrelated to OSes.
 At the moment I disagree on your statement regarding Linux. Please see: https://landfill.bugzilla.org/bugzilla-3.2-branch/show_bug.cgi?id=7170 This defect has title "Linux MAC bla". => Doing quicksearch on Linux will not return this defect => Doing quicksearch on MAC will not return this defect  I couldn't find the word MAC in the stop word list: http://dev.mysql.com/doc/refman/5.1/en/fulltext-stopwords.html Besides, I tried to search for several of these "stopwords", but they actually work... so I don't really follow what are the criteria for displaying or not displaying them. I expected a 100% fail on each word - if they really are "stopwords" in the literal sense.  Question : this list of Stopwords, is there another list that indicates the "forbidden" common words you refer to ? Question 2: Why is it when searching on a word from the Summary, the quicksearch returns different results compared to the Advanced ? Shouldn't it use the same algorithm (Quicksearch also searches the description, so it should be even a superset)?