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
van thong » van thuong, van phong, va thong
trinh han » trinh quan
anh tang » anh bang, anh nang, anh sang
anh dang » anh dong, anh dung, anh bang
han cau » hang cau, phan cau, van cau

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 tang) OR (anh dang)) van thong cong trinh han cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) or (nhiet nang)) - ((anh tang) OR (anh dang)) van thong cong trinh han cau~".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (nhiet nang)) - ((anh tang) OR (anh dang)) van thong cong trinh han cau*.