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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.

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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. – BalusC Apr 13 '11 at 14:24
but the problem is if there are many words in question, it is very hard to match. – Alan Tam Apr 13 '11 at 14:45
@Alan I imagine they use stop words to only pick out the relevant words: – Daniel DiPaolo Apr 13 '11 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.

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