vào tháng 3 vừa rồi 
in the past three months [ vào ] : at, on (date), in, to; to enter, go in, access
[ tháng ] : month
[ vừa ] : (1) to have just done something; (3) reasonable, right, suitable, fitting; to fit (clothes)
[ rồi ] : already, then, after that, afterwards, next
Most Common Compounds Set 1:
Most Common Compounds Set 2 :