Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh quang
dung quan » dung quang, dung luan, luong quan
hieu soat » hieu suat, hieu hoat, kiem soat
hieu luat » hieu qua
lieu soan » lieu lon, bien soan, lieu quan
thi nang » thi cong, ki nang, thi hanh
suat vat » suat va, xuat vat, thuat vat

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 quan luan ((hieu soat) or (hieu luat)) ) or ( thi nang suat vat lieu soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung quan luan ((hieu soat) OR (hieu luat)) ) OR ( thi nang suat vat lieu soan )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung quan luan ((hieu soat) or (hieu luat)) ) or ( thi nang suat vat lieu soan ))*.