Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu cach » hieu cach, thieu cac, hieu cac
hoc thieu » toc thieu, hoc hien
trung tan » trung tuan, trung tran, trung tang
dung cong » dung trong
tan dung » tran dung, tin dung, van dung
dan toan » van toan, dan than, manh toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu cach - thanh trung tan dung cong ((dan toan) or (dan gian)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu cach - thanh trung tan dung cong ((dan toan) OR (dan gian)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu cach - thanh trung tan dung cong ((dan toan) or (dan gian)) cau*.