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500 - Error: 500
500 -
SH404SEF : headers were already sent when I got control!
This is not necessarily a sh404sef error. It may have been caused by any of your extensions or even Joomla itself. If there is no error message above this one, providing more details, then you may look inside the error log file of your web server for an indication of what may be breaking things up.
URL=http://duhocnhat.nethoi-dap-voi-dai-dien-tai-nhat/cach-tinh-ti-le-di-hoc-o-nhat-nhu-the-nao

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SH404SEF : headers were already sent when I got control!
This is not necessarily a sh404sef error. It may have been caused by any of your extensions or even Joomla itself. If there is no error message above this one, providing more details, then you may look inside the error log file of your web server for an indication of what may be breaking things up.
URL=http://duhocnhat.nethoi-dap-voi-dai-dien-tai-nhat/cach-tinh-ti-le-di-hoc-o-nhat-nhu-the-nao