Perhaps you should try some spelling variations:
nhanh lang » nhanh quang, nhanh thang, nhan dang
duong van » duong va, luong va, dang van
trong van » trong cac
lang vat » lang van, dang vat, bang vat
vat dung » van dung, va dung, viet dung
toan cau » toan cao, toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu qua - nhanh lang vat dung ((duong van) or (trong van)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu qua - nhanh lang vat dung ((duong van) OR (trong van)) toan cau.
• Adding a wildcard symbol may retrieve word variants: ho hieu qua - nhanh lang vat dung ((duong van) or (trong van)) toan cau*.