Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nhanh tinh » nhanh thanh, hanh trinh, nhan sinh
hanh tinh » hanh trinh, thanh tinh, canh tinh
cua nhung » va nhung
nhu hieu » nhu hien, nha hieu, nho hieu
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
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: nhu hieu quang - ((hanh tinh) OR (nhanh tinh)) cua nhung ((cong dan) OR (cong san)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nhu hieu quang - ((hanh tinh) OR (nhanh tinh)) cua nhung ((cong dan) or (cong san)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: nhu hieu quang - ((hanh tinh) OR (nhanh tinh)) cua nhung ((cong dan) or (cong san)) toan cau*.