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exact: like: đó là lý do
VNEN 
đó là lý do * ☊ 
this is the reason why * ☊
[ đó ] : that, those, there, that
[ là ] : that; to be
[ lý ] : physics; reason, principle, law
[ do ] : because of, caused by, due to; derived from; on; by (a person); to derive from, cause