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
☆ NERVOUSLY; ANXIOUSLY Adverb 坐立不安地，惴惴不安地 một cách bồn chồn, một cách thắc thỏm, một cách thấp thỏm