Perhaps you should try some spelling variations:
nhiet nang » nhiet dong, viet nang, nhieu tang
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
anh trong » anh thuong, dinh trong, lang trong
trong va » trong van, trong ca, trong cac
va thong » va thuong, va phuong, he thong
hang cau » hang dau, hang ca, nhung cau
han cau » phan cau, van cau, han dau

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: theo ((hieu lang) OR (nhiet nang)) - anh trong va thong cong trinh ((han cau) OR (hang cau))~.
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (nhiet nang)) - anh trong va thong cong trinh ((han cau) or (hang cau))*.