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
☆☆ FLY Verb 飞来 bay đến, bay tới
☆☆ FLY ABOUT Verb 飞来飞去 bay khắp nơi, bay lung tung
☆ FLY IN Verb 飞来，飞进 bay vào