mũ lưỡi trai 
cap (with a visor), visored hat | Clothing and Accessories | cap | (Google translate:) mũ lưỡi trai | (Google translate:) Kappe |
[ mũ ] : hat, cap, bonnet
[ lưỡi ] : tongue; blade, sickle, (classifier for bladed objects)
[ trai ] : (1) [=giai] male; (2) to fast; (3) oyster; (4) study room
Most Common Compounds Set 1:
Most Common Compounds Set 2 :