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

Core Words Familarize yourself with the 'core words'.
Compounds Expand your vocabulary by studying more complex words built by the 'core words'.
Wordsense Learn about the wordsenses of the english term.

ETYMOLOGY

KOREAN 3.0 Eng Wordtype Etym. Gb Vie
☆☆ A FEW DAYS AGO Noun 几天前，前几天 mấy hôm trước, vài ngày trước
☆☆ SOME TIME AGO Adverb 几天前，前几天 mấy hôm trước