Perhaps you should try some spelling variations:
tinh duong » trinh duong, dinh duong, binh duong
dung quan » dung quang, dung luan, luong quan
hieu luat » hieu qua
hieu suat » hieu qua
kiem soat » kiem toan
quan van » luan van, quan va, quan luan
san kiem » van kiem, sat kiem, toan kiem
qua san » qua ban, cua san, qua 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 dung quan van ((hieu luat) or (hieu suat)) ) or ( tinh duong qua san kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dung quan van ((hieu luat) OR (hieu suat)) ) OR ( tinh duong qua san kiem soat )).
• Adding a wildcard symbol may retrieve word variants: (( trinh dung quan van ((hieu luat) or (hieu suat)) ) or ( tinh duong qua san kiem soat ))*.