Perhaps you should try some spelling variations:
trong vang » trong van, trong dang, trong tang
chieu xanh » chieu sach, chieu sang, chieu tinh
hieu xanh » hieu manh, hieu nganh, dieu hanh
luan dung » lan dung, luan dong, luan hung
vang toan » van toan, dang toan, quang toan
toan cao » toan ban, toan tap
ha tong » han tong, ha tang, ha long
ha dong » hoat dong, van dong

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu xanh) or (chieu xanh)) - ((ha tong) OR (ha dong)) luan dung trong vang toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (chieu xanh)) - ((ha tong) OR (ha dong)) luan dung trong vang toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) or (chieu xanh)) - ((ha tong) OR (ha dong)) luan dung trong vang toan cao".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (chieu xanh)) - ((ha tong) OR (ha dong)) luan dung trong vang toan cao*.