Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
thanh tung » thanh cong
thong cong » tong cong, thong thong, phong chong
hoc thieu » toc thieu, hoc hien
tung dai » trung dai, tuong dai, tung dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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