khi search tìm kiếm trên Form quay lại báo lỗi.

Confirm Form Resubmission
This webpage requires data that you entered earlier in order to be properly displayed. You can send this data again, but by doing so you will repeat any action this page previously performed.
Press the reload button to resubmit the data needed to load the page.
ERR_CACHE_MISS

LINK : HTTPS://STACKOVERFLOW.COM/QUESTIONS/19215637/NAVIGATE-BACK-WITH-PHP-FORM-SUBMISSION

Resolve the problem:

header('Cache-Control: no cache');