một trong số rất ít 
one of a small number of [ một ] : one; a, an
[ trong ] : during; in(side), among
[ số ] : (1) amount, number, figure, quantity, size (of clothing), digit, edition; digital; (2) gear (of a car); (3) destiny, fate, lot
[ rất ] : very, quite
[ ít ] : little, few, rare
Most Common Compounds Set 1:
Most Common Compounds Set 2 :