Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhieu tang » chieu sang, hieu lang, nhiet nang
manh trung » manh tung, thanh trung, manh hung
trung tham » trung tam, trung thanh, trung thang
nhung cong » thong cong, hang cong, nhung don
dung cong » dung trong
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 ((chieu sach) or (nhieu tang)) - manh trung tham ((nhung cong) OR (dung cong)) tinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (nhieu tang)) - manh trung tham ((nhung cong) OR (dung cong)) tinh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (nhieu tang)) - manh trung tham ((nhung cong) OR (dung cong)) tinh toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (nhieu tang)) - manh trung tham ((nhung cong) OR (dung cong)) tinh toan ban*.