Perhaps you should try some spelling variations:
quang luong » quang cuong, quang vuong, quang phuong
nhieu tang » chieu sang, nhiet nang
hieu lang » chieu sang, hieu quang, hieu van
tan quang » tran quang, tang quang, than quang
cong tan » cong tac, cong san, cong thanh
luong va » dung va
toan cau » toan cao, toan ban, toan tap
va toan » van toan, bai toan, tap toan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((nhieu tang) or (hieu lang)) - thanh cong tan quang luong va toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((nhieu tang) OR (hieu lang)) - thanh cong tan quang luong va toan cau.
• Adding a wildcard symbol may retrieve word variants: doi ((nhieu tang) or (hieu lang)) - thanh cong tan quang luong va toan cau*.