Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
thanh tung » thanh cong
hoc thieu » toc thieu, hoc hien
tung tuan » trung tuan, hung tuan, quang tuan
tuan dung » tuan duong, tran dung, tan dung
dung cong » dung trong
san toan » van toan, manh toan, xuan toan
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 sach - thanh tung tuan dung cong ((san toan) or (dan toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - thanh tung tuan dung cong ((san toan) OR (dan toan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - thanh tung tuan dung cong ((san toan) or (dan toan)) cau*.