Perhaps you should try some spelling variations:
thanh trung » thanh tung
thiet hach » thien hach, thuyet hach, thiet hai
trung phan » trung thanh, trung ha, dung phan
dung thang » hung thang, cung thang, dung thuong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
phan cong » thanh cong
dan than » dan chan, ban than, van than
phan lap » phan dau

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 trung phan cong ((dan than) or (dung thang)) phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet hach - thanh trung phan cong ((dan than) OR (dung thang)) phan lap.
• Adding a wildcard symbol may retrieve word variants: hoc thiet hach - thanh trung phan cong ((dan than) or (dung thang)) phan lap*.