Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, hieu luat
quang van » quang ban, quan van, quang uan
kien soat » kiem soat, bien soan, kien hoa
dung lan » dung luan, dung land, dung lam
binh dan » minh danh, binh dinh, binh luan
lan cao » lang cao, lan cho, nang cao
luan » quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh dung lan cao hieu soat ) or ( binh dan ((quang van) or (luan van)) kien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung lan cao hieu soat ) OR ( binh dan ((quang van) OR (luan van)) kien soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung lan cao hieu soat ) or ( binh dan ((quang van) or (luan van)) kien soat ))*.