Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung duong » nhung dung, nhung huong, nhung tuong
chieu sach » chinh sach, chiet tach, chieu sang
hieu cach » hieu cac, hieu ca, biet cach
trung vap » trung cap, trung va, trung van
vap nhung » va nhung, ve nhung, voi nhung
va than » va thanh, van than, va phan
va phap » va phat, ban phap

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 (chieu sach)) - thanh trung vap nhung duong ((va than) or (va phap)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu cach) OR (chieu sach)) - thanh trung vap nhung duong ((va than) OR (va phap)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu cach) OR (chieu sach)) - thanh trung vap nhung duong ((va than) or (va phap)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu cach) OR (chieu sach)) - thanh trung vap nhung duong ((va than) or (va phap)) cau*.