Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
hanh tang » hanh trang, anh tang, hanh mang
tong cong » trong cong, cong cong, dung cong
ho chieu » theo chieu, hoc thieu, mot chieu
tang van » dang van, hoang van, trong van
van tong » van thong, van trong, van tuong
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: ((doi chieu) OR (ho chieu)) sach - hanh tang van tong cong ((dan toan) or (dan than)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (ho chieu)) sach - hanh tang van tong cong ((dan toan) OR (dan than)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (ho chieu)) sach - hanh tang van tong cong ((dan toan) or (dan than)) tap".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (ho chieu)) sach - hanh tang van tong cong ((dan toan) or (dan than)) tap*.