Perhaps you should try some spelling variations:
thieu sach » thien hach, hieu cach, theo sach
chieu sach » chinh sach, chiet tach, chieu sang
manh trung » manh tung, thanh trung, manh hung
trung tuan » trung thanh, trung tam, tran tuan
thang long » thanh cong
hang nong » han tong
ban toan » bai toan, ban than, van toan
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: hoc ((thieu sach) OR (chieu sach)) - manh trung tuan ((hang nong) or (thang long)) ban toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (chieu sach)) - manh trung tuan ((hang nong) OR (thang long)) ban toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) OR (chieu sach)) - manh trung tuan ((hang nong) or (thang long)) ban toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) OR (chieu sach)) - manh trung tuan ((hang nong) or (thang long)) ban toan ban*.