chốc chốc * ☊ 
from time to time, now and then * ☊ lâu lâu * ☊ from time to time, now and then * ☊ thỉnh thoảng * ☊ from time to time, now and then, sometimes, every so often, occasionally * ☊ đôi khi ☊ (S) sometimes, from time to time vsl2