Perhaps you should try some spelling variations:
nhanh mang » nhanh lang, hanh mang, nhanh quang
hieu lang » chieu sang, hieu quang, nhieu tang
trong van » trong cac
hoi hieu » hoi phieu, hoi tieu, moi hieu
van toan » van tuan, van tan, van thanh
toan ban » van ban
va dung » van dung, va duong, vat dung

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 - nhanh mang ((va dung) or (van dong)) trong van toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu lang - nhanh mang ((va dung) OR (van dong)) trong van toan ban*.