Perhaps you should try some spelling variations:
tinh luong » tinh huong, dinh luong, minh luong
hieu soat » hieu hoat, hieu luat, kiem soat
hieu suat » hieu luat, hieu qua
dung lam » dung luan, dung tai, dung dat
van hieu » cao hieu
quan van » quan va, quan luan, quan doan
lam van » lam san, nam van, dam van
luan » lan

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

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