Perhaps you should try some spelling variations:
thanh quang » nhanh quang, thanh quan, than quang
nhieu tang » chieu sang, nhiet nang
cong thanh » dong thanh, cong trinh, cong tan
quang dung » quang trung, ung dung, cuong dung
hieu lang » chieu sang, hieu quang, hieu van
toan ban » van ban
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 thanh quang dung va toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((nhieu tang) OR (hieu lang)) - thanh cong thanh quang dung va toan ban.
• Adding a wildcard symbol may retrieve word variants: doi ((nhieu tang) or (hieu lang)) - thanh cong thanh quang dung va toan ban*.