Perhaps you should try some spelling variations:
thien hoat » trien hoat, thien thuat, tien hoa
trinh han » trinh quan
kiem soat » kiem toan
hieu suat » hieu luat, hieu qua
han hang » hang hang, han chang, ban hang
dung dan » dung dat, dung san, tung dan
van hieu » cao hieu
dan van » dang van, doan van, dao van

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

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