Perhaps you should try some spelling variations:
luong quan » thong quan, duong qua
hieu soat » hieu hoat, hieu luat, kiem soat
hieu suat » hieu luat, hieu qua
tin luong » tien luong, tin huong, tin tuong
bien soan » bien so
quan cua » quan luan, ban cua, gian cua
cua bien » cua ban, cua dieu, va bien

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 (luan or lan) van ((hieu soat) OR (hieu suat)) ) or ( tin luong quan cua bien soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung (luan OR lan) van ((hieu soat) OR (hieu suat)) ) OR ( tin luong quan cua bien soan )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tin dung (luan or lan) van ((hieu soat) OR (hieu suat)) ) or ( tin luong quan cua bien soan ))".
• Adding a wildcard symbol may retrieve word variants: (( tin dung (luan or lan) van ((hieu soat) OR (hieu suat)) ) or ( tin luong quan cua bien soan ))*.