Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hanh dung » thanh dung, anh dung, hanh dong
cua thong » cua thuong, cua khong, suat thong
nho hieu » nha hieu, nho sieu, nhu hieu
cua tong » cua cong, cua dong, cua nong
han tap » han tai, toan tap, nhan tai
san tay » ban tay, dan tay, han tay

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: nho hieu lang - hanh dung ((cua thong) OR (cua tong)) cong trinh ((han tap) OR (san tay))~.
• Adding a wildcard symbol may retrieve word variants: nho hieu lang - hanh dung ((cua thong) or (cua tong)) cong trinh ((han tap) or (san tay))*.