Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
thanh dung » thanh duong, thanh tung, thanh hung
hoc thieu » toc thieu, hoc hien
dung van » duong van, dung va, dang van
van dung » van dong, xay dung, tin dung
van toan » van tuan, van tan, van thanh
dan than » dan chan, ban than, van than

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 sach - thanh dung van dung trong ((van toan) or (dan than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - thanh dung van dung trong ((van toan) OR (dan than)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - thanh dung van dung trong ((van toan) or (dan than)) cao*.