Dear phan tuan son

Most of the LCDs I have used have an active high enable signal. Your code suggests that you are using active low. Perhaps your problem lies here. this is an extract of your Write_Text subroutine.

SETB B0h.7 ;set EN line
SETB B0h.6 ;RS line ?
MOV 80h,E0h ;data to write
CLR B0h.7 ;clr EN line
LCALL WAIT_LCD
RET

You should change this to look like this
SETB B0h.6
MOV 80h,E0h
SETB B0h.7 ;set EN line
CLR B0h.7 ;clr EN line
LCALL WAIT_LCD
RET

I hope your problem is solved by this. Of course, you have to make similar changes wherever you write to the LCD either command or data.


Jerson