Perhaps you should try some spelling variations:
thanh tung » thanh cong
chua duong » chua dong, thuy duong, cau duong
duong cong » dung cong, luong cong, duong trong
thi chieu » thi chien, thi hieu, theo chieu
tung chua » cung chua, cong chua, dung nhua
ho chieu » theo chieu, hoc thieu, doi chieu
tan toan » tap toan, van toan, dan toan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (thi chieu)) sach - thanh tung chua duong cong ((tan toan) OR (tan tran)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (thi chieu)) sach - thanh tung chua duong cong ((tan toan) OR (tan tran)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (thi chieu)) sach - thanh tung chua duong cong ((tan toan) OR (tan tran)) cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (thi chieu)) sach - thanh tung chua duong cong ((tan toan) OR (tan tran)) cau*.