Perhaps you should try some spelling variations:
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
chinh cua » chinh ca, chinh sua, hinh cua
cua nhung » va nhung
cong van » cong vang, cong san, cong tan
song van » hoang van, trong van, duong van
than ban » thanh ban, toan ban, than man

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