Perhaps you should try some spelling variations:
luong quan » thong quan, duong qua
hieu soat » hieu suat, hieu hoat, hieu luat
tin luong » tien luong, tin huong, tin tuong
quan quan » quan quang, qua quan, quan luan
quan mien » quan dien, quang dien, quang lien
mien soat » kiem soat, bien soan, dien hoat
van hieu » cao hieu
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 luan van hieu soat ) or ( tin luong quan quan mien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung luan van hieu soat ) OR ( tin luong quan quan mien soat )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung luan van hieu soat ) or ( tin luong quan quan mien soat ))*.