Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
thanh tung » thanh cong
hieu lang » chieu sang, nhieu tang, hieu van
ban luong » ban huong, van luong, ban tuong
tung cua » trung cua, tuong cua, dung cua
luong va » dung va
toan cao » toan ban
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: nho ((hieu lang) or (hieu quang)) - thanh tung cua ban luong va ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho ((hieu lang) OR (hieu quang)) - thanh tung cua ban luong va ((toan cao) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: nho ((hieu lang) or (hieu quang)) - thanh tung cua ban luong va ((toan cao) or (toan tap))*.