Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
dang vatn » dang van, dong vat, tang van
bang cong » dang cong, bang song, hang cong
hoi hieu » hoi phieu, hoi tieu, moi hieu
dang vat » dang van, dong vat, dang nhat
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan tap » toan ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu quang - anh ((dang vat) OR (dang vatn)) bang cong tac toan tap~.
• Adding a wildcard symbol may retrieve word variants: hoi hieu quang - anh ((dang vat) or (dang vatn)) bang cong tac toan tap*.