Perhaps you should try some spelling variations:
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
hanh luan » khanh luan, hang luan, hanh luat
van thong » van thuong, van phong, va thong
cong van » cong vang, cong san, cong tan
song van » hoang van, trong van, duong van
ban hai » ban thai, bang hai, van hai

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