Perhaps you should try some spelling variations:
phuong danh » phuong anh, phuong dinh, phuong hanh
phuong dan » phuong doan, huong dan, phuong lan
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
quang cua » quan cua, quang tuan, quang huy
toan cau » toan cao, toan ban, toan tap
cua chu » sua chua

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 (hien hanh)) - nhanh quang cua chu ((phuong dan) OR (phuong danh)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) OR (hien hanh)) - nhanh quang cua chu ((phuong dan) or (phuong danh)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) OR (hien hanh)) - nhanh quang cua chu ((phuong dan) or (phuong danh)) toan cau*.