vài tuần trước khi 
a few weeks before [ vài ] : some, few, several
[ tuần ] : (1) week, 10 days, decade; (2) round, turn around; (3) to visit, guard, patrol
[ trước ] : before, in front, previously; faced with, in the face of, ahead of
[ khi ] : occasion, time (when something happens), when, at the time of, if
Most Common Compounds Set 1:
Most Common Compounds Set 2 :