Perhaps you should try some spelling variations:
dung phuong » dung thuong, bang phuong, dung chung
chieu xanh » chieu sach, chieu sang, chieu tinh
hien xanh » hien hanh, hien nhanh, hien khanh
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
phuong va » thuong va, phong va, huong va
toan cao » toan ban, toan tap
va toan » van toan, bai toan, tap toan

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) or (trung cap)) dung phuong va toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (chieu xanh)) - hanh ((trung cua) OR (trung cap)) dung phuong va 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 cap)) dung phuong va toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) OR (chieu xanh)) - hanh ((trung cua) or (trung cap)) dung phuong va toan cao*.