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
dien toan » dien thanh, dien thoai, dien hoa
van hieu » cao hieu
he dien » he dieu, he lien, he mien
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: (( trinh dung luan van hieu soat ) or ( tin luong quan he dien toan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dung luan van hieu soat ) OR ( tin luong quan he dien toan )).
• Adding a wildcard symbol may retrieve word variants: (( trinh dung luan van hieu soat ) or ( tin luong quan he dien toan ))*.