Perhaps you should try some spelling variations:
thanh luong » thanh huong, thanh long, thanh cuong
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
luong quan » thong quan, duong qua
quan dung » quang dung, quan duong, qua dung
dung cong » dung trong
van tan » van tuan, van tai, van thanh

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 sang)) - thanh luong quan dung cong ((van tan) or (van ban)) tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (chieu sang)) - thanh luong quan dung cong ((van tan) OR (van ban)) tai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) OR (chieu sang)) - thanh luong quan dung cong ((van tan) or (van ban)) tai".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) OR (chieu sang)) - thanh luong quan dung cong ((van tan) or (van ban)) tai*.