Perhaps you should try some spelling variations:
hien nhanh » thien thanh, tien thanh, dien thanh
hien hanh » dieu hanh
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
tinh quan » tinh quang, trinh quan, tin quan
quan dung » quang dung, quan duong, qua dung
dung cong » dung trong
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » 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 hanh) OR (hien nhanh)) - hanh tinh quan dung cong san toan cau~.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien hanh) or (hien nhanh)) - hanh tinh quan dung cong san toan cau*.