Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
cua nhung » va nhung
nho hieu » nha hieu, nho sieu, nhu hieu
anh tang » anh bang, anh dang, anh nang
tang cua » mang cua, hang cua, tang luan
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: nho hieu quang - anh tang cua nhung ((cong dan) or (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho hieu quang - anh tang cua nhung ((cong dan) OR (cong san)) toan cao.
• Adding a wildcard symbol may retrieve word variants: nho hieu quang - anh tang cua nhung ((cong dan) or (cong san)) toan cao*.