Perhaps you should try some spelling variations:
dung phuong » dung thuong, bang phuong, dung chung
chieu xanh » chieu sach, chieu sang, chieu tinh
trung tuan » trung thanh, trung tam, tran tuan
phuong dan » phuong danh, phuong doan, huong dan
hien xanh » hien hanh, hien nhanh, hien khanh
trung cua » truong cua, trung cap, dung cua
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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

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