Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
tranh vat » trinh vat, tranh va, tranh van
duong van » luong va, dang van, trong van
hoi hieu » hoi phieu, hoi tieu, moi hieu
vat dung » van dung, va dung, viet dung
duong va » dung va, luong va, dong va
cong dan » cong san, cong tan, huong dan
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: hoi hieu lang - canh tranh vat dung ((((duong van) or (duong va))) or (cong dan)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu lang - canh tranh vat dung ((((duong van) OR (duong va))) OR (cong dan)) toan tap.
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - canh tranh vat dung ((((duong van) or (duong va))) or (cong dan)) toan tap*.