Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu lang » chieu sang, hieu quang, nhieu tang
bang cong » dang cong, bang song, hang cong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan tap » toan ban
ho hieu » ho chieu, hoi hieu, nho hieu
va bang » va nang, va lang, va ban

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

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