From Wiktionary, the free dictionary
From ដឹង (dəng, “to know, to be aware”) with prefixed dVN- (causative).
ដណ្ដឹង • (dɑndəng) (abstract noun ការដណ្ដឹង)
- (of a parent) to ask for someone's child's hand (esp. a daughter) in marriage
- (archaic) to ask a question