Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
thu phuong » thi phuong, thu huong, theo phuong
phuong dan » phuong danh, phuong doan, huong dan
hien hanh » dieu hanh
quang cua » quan cua, quang tuan, quang huy
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
cua thu » cua chu, ca thu, cua tu

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 hanh) OR (chieu xanh)) - nhanh quang cua thu phuong dan toan cao~.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien hanh) or (chieu xanh)) - nhanh quang cua thu phuong dan toan cao*.