Fatal error: Uncaught PDOException: SQLSTATE[42000]: Syntax error or access violation: 1115 Unknown character set: 'utf' in /home/nhttrqhz/public_html/x/KQ_THI_VAO_C3_tinh2.php:12 Stack trace: #0 /home/nhttrqhz/public_html/x/KQ_THI_VAO_C3_tinh2.php(12): PDO->query() #1 {main} thrown in /home/nhttrqhz/public_html/x/KQ_THI_VAO_C3_tinh2.php on line 12