Perhaps you should try some spelling variations:
dung phuong » dung thuong, bang phuong, dung chung
thieu sach » chieu sach, thien hach, hieu cach
truong cao » truong dai
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, trung cap
dan toan » van toan, manh toan, xuan toan
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 ((trung cua) or (truong cao)) dung phuong ((dan toan) OR (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - thanh ((trung cua) OR (truong cao)) dung phuong ((dan toan) OR (dan than)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - thanh ((trung cua) or (truong cao)) dung phuong ((dan toan) OR (dan than)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - thanh ((trung cua) or (truong cao)) dung phuong ((dan toan) OR (dan than)) cau*.