Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
manh trung » manh tung, thanh trung, manh hung
qua dung » quang dung, su dung, qua cong
cong dan » cong san, cong tan, huong dan
dan van » dang van, doan van, dao van

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 sang) or (chieu sach)) - manh trung ((qua dung) OR (qua song)) cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chieu sach)) - manh trung ((qua dung) OR (qua song)) cong dan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (chieu sach)) - manh trung ((qua dung) OR (qua song)) cong dan van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (chieu sach)) - manh trung ((qua dung) OR (qua song)) cong dan van ban*.