Perhaps you should try some spelling variations:
quang luan » quan luan, quang tuan, quang uan
tinh dung » trinh dung, tinh huong, anh dung
hieu suat » hieu luat, hieu qua
hien soat » thien hoat, kiem soat, bien soan
quan van » quan va, quan luan, quan doan
van hieu » cao hieu
van hien » van tien

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