Perhaps you should try some spelling variations:
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
dung duong » dung dong, dong duong, dung dung
duong manh » duong van
manh toan » thanh toan, anh tuan, tinh toan
manh cua » doanh cua
toan ban » van ban
ban cua » ban quan

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