Perhaps you should try some spelling variations:
van nhuong » van chuong, van phuong, van huong
hieu quang » thieu quang, hieu quan, hieu qua
hieu lang » chieu sang, nhieu tang, hieu van
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 lang) OR (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 lang) OR (hieu quang)) - anh tang van nhuong ((cong san) OR (cong tac)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) OR (hieu quang)) - anh tang van nhuong ((cong san) or (cong tac)) toan tap".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) OR (hieu quang)) - anh tang van nhuong ((cong san) or (cong tac)) toan tap*.