1 (wiktionary) 2 (vi.wikipedia) 3 (en.wikipedia) 4 (glosbe)

Core Words Familarize yourself with the 'core words'.
Etymology Explore the origin of the 'core words'.
Wordsense Learn about the wordsenses of the english term.

COMPOUNDS

ngày lễ anniversary, day of remembrance, holiday, feast-day
ngày lễ chính thức legal holiday