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COMPOUNDS
hoài cổ 
to remember things in the past
hồi nào when (in the past)
hồi trước in the past
lần nào which time, ever (in the past)
ngày trước before, in the past, previously, in the old days, in former times
như vừa qua as before, as in the past
trong nhiều năm qua for many years (in the past), in previous years
trong quá khứ in the past
trong thời qian qua in the past, in former times, recently
trước kia before, previous, former; formerly, once, in the past
vào tháng 3 vừa rồi in the past three months
độ trước in the past
hoài cổ to remember things in the past hồi nào when (in the past) hồi trước in the past lần nào which time, ever (in the past) ngày trước before, in the past, previously, in the old days, in former times như vừa qua as before, as in the past trong nhiều năm qua for many years (in the past), in previous years trong quá khứ in the past trong thời qian qua in the past, in former times, recently trước kia before, previous, former; formerly, once, in the past vào tháng 3 vừa rồi in the past three months độ trước in the past