Perhaps you should try some spelling variations:
trinh dan » trinh han, trinh san, trinh da
hieu suat » hieu qua
hieu luat » hieu qua
tinh nang » trinh nang, tin nang, tich nang
nang quan » ban quan, nang suat
quan minh » quang minh, quan binh, xuan minh
minh hien » minh hieu, minh kieu
hien soat » thien hoat, kiem soat, bien soan
dan hung » dang hung, doan hung, dan dung
hung van » phung van, nhung van, dung 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 dan hung van ((hieu suat) or (hieu luat)) ) or ( tinh nang quan minh hien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dan hung van ((hieu suat) OR (hieu luat)) ) OR ( tinh nang quan minh hien soat )).
• Adding a wildcard symbol may retrieve word variants: (( trinh dan hung van ((hieu suat) or (hieu luat)) ) or ( tinh nang quan minh hien soat ))*.