Perhaps you should try some spelling variations:
duong trong » dung trong
thiet hach » thien hach, thuyet hach, thiet hai
thanh tung » thanh cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tho duong » thao duong, theo duong, thong duong
trong dan » trong dang, trong san, trong tan
tung tho » tung ho, truong tho, trong tho
dan can » dan chan, dan canh, dan ca
can cau » van cau, ban cau, ca cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thiet hach - thanh tung tho duong trong dan can cau~.
• Adding a wildcard symbol may retrieve word variants: hoc thiet hach - thanh tung tho duong trong dan can cau*.