Perhaps you should try some spelling variations:
nhieu tang » chieu sang, nhiet nang
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, hieu van
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
dong va » dung va, luong va, dong hoa
dong ha » dong hoa, dong hoc, dong tai

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: ho ((nhieu tang) OR (hieu lang)) - anh ((dong va) OR (dong ha)) thong cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((nhieu tang) or (hieu lang)) - anh ((dong va) OR (dong ha)) thong cong tac toan cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((nhieu tang) or (hieu lang)) - anh ((dong va) OR (dong ha)) thong cong tac toan cau*.