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
☆ VARIABLE Noun 变数变数，不确定因素 yếu tố gây đột biến
☆ CONSTANT; STEADFAST; INVARIABLE Adjective 一如既往，始终如一 trước sau như một