Perhaps you should try some spelling variations:
trinh thong » trinh thuong, trinh trong, trinh tong
luong quan » duong qua
tin luong » tien luong, tin huong, tin tuong
hieu suat » hieu luat, hieu qua
quan van » luan van, quan luan, quan doan
van hieu » cao hieu
quan va » quan vi, quan ha, luan va
va kiem » van kien
tra » tran

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( tin luong quan van hieu suat ) or ( trinh thong quan va kiem tra ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin luong quan van hieu suat ) OR ( trinh thong quan va kiem tra )).
• Adding a wildcard symbol may retrieve word variants: (( tin luong quan van hieu suat ) or ( trinh thong quan va kiem tra ))*.