Perhaps you should try some spelling variations:
nhieu tang » chieu sang, nhiet nang
thanh tung » thanh cong
hieu lang » chieu sang, hieu quang, hieu van
cua dung » cua dang, cua dong, cua rung
qua dung » quang dung, su dung, qua song
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cau » toan cao, toan ban, toan tap

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)) - thanh tung ((cua dung) OR (qua dung)) cong tan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((nhieu tang) or (hieu lang)) - thanh tung ((cua dung) OR (qua dung)) cong tan toan cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((nhieu tang) or (hieu lang)) - thanh tung ((cua dung) OR (qua dung)) cong tan toan cau*.