Perhaps you should try some spelling variations:
chieu sang » chieu sach, hieu lang, nhieu tang
chieu xanh » chieu sach, chieu tinh, hieu manh
hanh tang » hanh trang, anh tang, hanh mang
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, 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 sang) or (chieu xanh)) - hanh tang ((cua nhung) OR (va nhung)) cong dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chieu xanh)) - hanh tang ((cua nhung) OR (va nhung)) cong dan than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (chieu xanh)) - hanh tang ((cua nhung) OR (va nhung)) cong dan than cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (chieu xanh)) - hanh tang ((cua nhung) OR (va nhung)) cong dan than cao*.