Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, hieu luat
tinh nang » trinh nang, tin nang, tich nang
nang quan » ban quan, nang suat
luan bien » luan lien, xuan bien, luong bien
bien soan » bien so
luan cao » juan cao, luan bao, quang cao

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