like: đó là nguyên do tại sao
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Composite Words Listening Comprehension Oxford Topics Duolingo Topics 315 Activities
BEGINNER LEVEL
exact:
VNEN 
đó là nguyên do tại sao * ☊ 
that is the reason why * ☊
[ đó ] : that, those, there, that
[ là ] : that; to be
[ nguyên ] : acting, holding a post temporarily; to be intact, unaltered, brand new, original; in full; all, whole, entire
[ do ] : because of, caused by, due to; derived from; on; by (a person); to derive from, cause
[ đó ] : there
[ nguyên ] : original