Perhaps you should try some spelling variations:
manh trung » manh tung, thanh trung, manh hung
chiet tach » chieu sach
trung tuan » trung thanh, trung tam, tran tuan
thang long » thanh cong
hieu cach » hieu cac, chieu sach, hieu ca
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 ((hieu cach) or (chiet tach)) - 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 ((hieu cach) OR (chiet tach)) - manh trung tuan ((hang nong) OR (thang long)) ban toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu cach) or (chiet tach)) - manh trung tuan ((hang nong) or (thang long)) ban toan ban*.