I am wondering that if admins can add an automatic "search" function in the creation process of new thread, it can help to minimize the amount of similar threads.
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Thanks not a bad idea, malikusama. I have seen this feature on a lot of other websites.
I think this could be included in the new forum software (beta.bitcointalk.com) features proposals.
People can use Google Search.
Most answers on my question I found using Google and it shows me many threads on bitcointalk.
People are lazy to do that
I'm also using Google search because it's faster than searching the forum. The down side is that it take a few days for the google bot to crawl new pages created here so you might not see all of the posts (especially the new ones) in your search.