Perhaps you should try some spelling variations:
nhanh mang » hanh mang, nhanh quang, nhanh thang
nhanh lang » nhanh quang, nhanh thang, nhan dang
thong hang » thong hoang, thong mang, thong nang
phan hieu » van hieu, phan kien, gian hieu
hieu quan » hieu qua, lieu quan, thien quan
va thong » va thuong, va phuong, he thong

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

• Performing a fuzzy search may retrieve terms with similar spellings: phan hieu quan - ((nhanh mang) or (nhanh lang)) va thong thong hang va bai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: phan hieu quan - ((nhanh mang) OR (nhanh lang)) va thong thong hang va bai*.