Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chiet tach, chieu sang, chieu xanh
vap nhung » va nhung, voi nhung, cam nhung
ve nhung » va nhung, tu nhung
cong ban » cong bang, cong san, cong tan
ban than » ban thanh, van thanh, ban hang
than cau » toan cau, phan cau, than cap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) OR (chinh sach)) - thanh trung ((vap nhung) or (ve nhung)) cong ban than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chinh sach)) - thanh trung ((vap nhung) OR (ve nhung)) cong ban than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) OR (chinh sach)) - thanh trung ((vap nhung) or (ve nhung)) cong ban than cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) OR (chinh sach)) - thanh trung ((vap nhung) or (ve nhung)) cong ban than cau*.