For novices, the easiest grip style to begin with is usually American grip. This style is versatile, fairly easy to learn, and offers a good mix of power and control, making it a good choice for almost every drummer and almost every style of music. To begin, raise one hand and turn your wrist so that its palm is facing down and its index finger is pointed out straight ahead, parallel with the floor For this grip (and the styles below), you'll want your hands to be about an inch (2.5cm) or two above the snare drum head (assuming that you're playing at an ordinary drum set). However, if this isn't comfortable for you, feel free to move your hands to a position that is.

TL;DR in Vietnamese:
Chỉ ngón trỏ của bạn ra ngoài.