HSK 3.0 11000 CHINESE WORDS
ENGLISH 6000 THEME WORDS
OXFORD 5000 CORE WORDS
TANAKA 6000 CORE WORDS
hợp tác chặt chẽ với nhau 
to work closely together, cooperate closely with each other
[ hợp ] : to suit, fit, be compatible, go together, unite
[ tác ] : (1) job, task, work; (2) to make, do
[ chặt ] : (1) fast, close, tight; solid; (2) to cut, chop down
[ với ] : with, and; to join (someone), reach for (something)
[ nhau ] : (1) together, in company, each other; (2) placenta
hợp tác chặt chẽ với nhau to work closely together, cooperate closely with each other [ tác ] : (1) job, task, work; (2) to make, do
[ chặt ] : (1) fast, close, tight; solid; (2) to cut, chop down
[ với ] : with, and; to join (someone), reach for (something)
[ nhau ] : (1) together, in company, each other; (2) placenta