Perhaps you should try some spelling variations:
nhieu tang » hieu lang, nhiet nang
chieu sang » chieu sach, chieu xanh, hieu lang
thanh tung » thanh cong
qua dung » quang dung, qua song, qua cong
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 (chieu sang)) - thanh tung ((qua dung) OR (su dung)) cong tan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((nhieu tang) or (chieu sang)) - thanh tung ((qua dung) OR (su dung)) cong tan toan cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((nhieu tang) or (chieu sang)) - thanh tung ((qua dung) OR (su dung)) cong tan toan cau*.