Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu lang » chieu sang, hieu quang, nhieu tang
dang cong » dung cong
hang cong » hang nong, bang cong, thanh cong
doc hieu » toc thieu, hoc thieu, hoc hien
tung cap » trung cap, cung cap, thong cap
van tinh » van thinh, van minh, ban tinh
chat » nhat, phat

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu lang - thanh tung cap ((dang cong) or (hang cong)) van tinh chat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - thanh tung cap ((dang cong) OR (hang cong)) van tinh chat.
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - thanh tung cap ((dang cong) or (hang cong)) van tinh chat*.