leveling

1.

san lấp mặt bằng

the height of something:

:
The water level in the lake is much higher after heavy rain.
1.

san lấp mặt bằng

at the same height:

:
The top of the tree is level with his bedroom window.
1.

san lấp mặt bằng

to make a surface flat:

:
Level the wet cement before it sets.