Perhaps you should try some spelling variations:
duong cong » dung cong, luong cong, duong trong
chieu tinh » trieu tinh, lieu tinh, chau tinh
hien xanh » hien hanh, hien nhanh, chieu xanh
anh quang » anh xquang, anh quan, nhanh quang
quang va » quang van, quan va, quang ma
va duong » van duong, va tuong, va huong
van toan » van tuan, van thanh, manh toan
van tan » van tuan, van ban, van tai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien xanh) or (chieu tinh)) - anh quang va duong cong ((van toan) OR (van tan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (chieu tinh)) - anh quang va duong cong ((van toan) OR (van tan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (chieu tinh)) - anh quang va duong cong ((van toan) OR (van tan)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (chieu tinh)) - anh quang va duong cong ((van toan) OR (van tan)) ban*.