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Looking at the directory the number on the article is 7 but the link to that article would be 12.
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http://www.bc.doanketviet.com/modules/article/view.article.php?12
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I believe your link is wrong. My address bar shows you are trying to link to a file that does not exist, which gives you the same no access error as I get when I put another wrong number in. I checked it using 20 instead of 7