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
van toan » van tan, van thanh, manh toan
van tuan » van quan, van ban, anh tuan

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)) ((van toan) OR (van tuan)) 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)) ((van toan) OR (van tuan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - thanh tung dai ((thong cong) or (trong cong)) ((van toan) OR (van tuan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - thanh tung dai ((thong cong) or (trong cong)) ((van toan) OR (van tuan)) cao*.