mùa khô

dry season

Typed without accents: mua kho

Meaning

dry season
noun

In the South roughly December to April; the rest of the year is mùa mưa.
- Mùa khô ở Sài Gòn nắng lắm.
  The dry season in Saigon is very sunny.
- Mùa khô là lúc đẹp nhất để đi du lịch.
  The dry season is the best time to travel.