Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu hach » thien hach, chieu sach, hieu cach
trung phan » trung thanh, trung ha, dung phan
dung thang » hung thang, cung thang, dung thuong
phan cong » thanh cong
dan toan » van toan, dan than, manh toan
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: toc thieu hach - thanh trung phan cong ((dan toan) or (dung thang)) phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu hach - thanh trung phan cong ((dan toan) OR (dung thang)) phan lap.
• Adding a wildcard symbol may retrieve word variants: toc thieu hach - thanh trung phan cong ((dan toan) or (dung thang)) phan lap*.