Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
van nhuong » van chuong, van phuong, van huong
theo hieu » theo chieu, theo tieu, thien hieu
anh tang » anh bang, anh dang, anh nang
tang van » dang van, hoang van, trong van
cong tac » cong ty
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: theo hieu quang - anh tang van nhuong ((cong san) or (cong tac)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu quang - anh tang van nhuong ((cong san) OR (cong tac)) toan tap.
• Adding a wildcard symbol may retrieve word variants: theo hieu quang - anh tang van nhuong ((cong san) or (cong tac)) toan tap*.