Perhaps you should try some spelling variations:
trinh ban » trinh han, trinh san, trinh dan
hieu suat » hieu qua
hieu luat » hieu qua
dung tang » dung thang, dung trang, dung dang
kien soat » kiem soat, bien soan, kien hoa
ban hang » ngan hang
tang van » dang van, hoang van, trong van
van kien » van tien, van hien, van chien

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( trinh ban hang va ((hieu suat) or (hieu luat)) ) or ( tin dung tang van kien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh ban hang va ((hieu suat) OR (hieu luat)) ) OR ( tin dung tang van kien soat )).
• Adding a wildcard symbol may retrieve word variants: (( trinh ban hang va ((hieu suat) or (hieu luat)) ) or ( tin dung tang van kien soat ))*.