Perhaps you should try some spelling variations:
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
hanh tang » hanh trang, anh tang, hanh mang
cong vang » cong lang, cong quang, cong ngang
tang cua » mang cua, hang cua, tang luan
cua tong » cua cong, cua dong, cua nong
cong van » cong san, song van, cong tan

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 xanh) OR (chieu sach)) - hanh tang cua tong ((cong van) or (cong vang)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (chieu sach)) - hanh tang cua tong ((cong van) OR (cong vang)) van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) OR (chieu sach)) - hanh tang cua tong ((cong van) or (cong vang)) van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) OR (chieu sach)) - hanh tang cua tong ((cong van) or (cong vang)) van ban*.