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
☆☆ UNHAPINESS; MISERY Noun 不幸不幸 sự bất hạnh
☆ BEING UNDERPRIVILEGED; BEING UNFORTUNATE; BEING DISADVANTAGED Noun 不遇不幸 sự bất hạnh, sự rủi ro