Perhaps you should try some spelling variations:
dung duong » dung dong, dong duong, dung dung
duong manh » duong van
doi chieu » doc hieu, doi chi, mot chieu
manh toan » thanh toan, anh tuan, tinh toan
ho chieu » theo chieu, hoc thieu, mot chieu
thong tu » thong tin, thong ke
toan ban » van ban

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 - thanh ((thong tu) OR (phong tuc)) dung duong manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (ho chieu)) sach - thanh ((thong tu) OR (phong tuc)) dung duong manh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (ho chieu)) sach - thanh ((thong tu) OR (phong tuc)) dung duong manh toan ban".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (ho chieu)) sach - thanh ((thong tu) OR (phong tuc)) dung duong manh toan ban*.