Perhaps you should try some spelling variations:
dung phuong » dung thuong, bang phuong, dung chung
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trung » thanh trung, hanh trang, manh trung
hien xanh » hien hanh, hien nhanh, hien khanh
trung cua » truong cua, trung tuan, trung cap
cua dung » cua dang, cua dong, qua dung
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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