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
☆☆ CHANCE; ACCIDENT Noun 偶然偶然 sự tình cờ, sự ngẫu nhiên
☆☆ BY CHANCE; BY ACCIDENT Adverb 偶然 히 偶然地 một cách ngẫu nhiên, một cách tình cờ