Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, hieu luat
tich nang » tich van, tin nang
nang quan » ban quan, nang suat
quan dong » quang dong, quan long, quan hoang
dong bien » dong dien, dong tien, long bien
bien soan » bien so
luan cao » juan cao, quang cao, luan chat
luan bao » luat bao, luan ban, xuan bao

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) OR (luan bao)) hieu soat ) or ( tich nang quan dong bien soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung ((luan cao) OR (luan bao)) hieu soat ) OR ( tich nang quan dong bien soan ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh dung ((luan cao) OR (luan bao)) hieu soat ) or ( tich nang quan dong bien soan ))*".