When I complete my title of question, the related questions are listed below. I am confused how can SO select the questions, there are no key words or someting like that.
2 Answers
It uses the words you have just typed in for your title as key words:-)
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Good question titles are excellent search keywords.– user138231Commented Apr 13, 2011 at 14:24
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but the problem is if there are many words in question, it is very hard to match.– Alan TamCommented Apr 13, 2011 at 14:45
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@Alan I imagine they use stop words to only pick out the relevant words: en.wikipedia.org/wiki/Stop_words Commented Apr 13, 2011 at 14:58
Per Jeff's answer here,
The /questions/ask page is the same as searching with intitle:1 , that is, it only searches title text exclusively.