Perhaps you should try some spelling variations:
quan duong » tuan duong, quan dong, qua duong
dung juan » dung luan, dung quan, dung xuan
hieu suat » hieu luat, hieu qua
tinh nang » trinh nang, tin nang, tich nang
nang quan » ban quan, nang suat
juan cao » quang cao, toan cao, quan cau
bien so » bien doi

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