Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
thanh tung » thanh cong
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
dan toan » van toan, dan than, manh toan
tung va » trung va, tuong va, dung va
van tan » van tuan, van ban, van tai

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