Perhaps you should try some spelling variations:
trinh thong » trinh thuong, trinh tong, trinh khong
trinh trong » trinh truong, tranh trong, trinh trung
luong quan » thong quan, duong qua
tin luong » tien luong, tin huong, tin tuong
hieu suat » hieu luat, hieu qua
quan van » luan van, quan va, quan luan
van hieu » cao hieu
quan vi » quan li, quan tri, quan doi
vi kiem » va kiem, bi kiem, ve kiem
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) OR (trinh trong)) quan vi kiem tra ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin luong quan van hieu suat ) OR ( ((trinh thong) OR (trinh trong)) quan vi kiem tra )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tin luong quan van hieu suat ) or ( ((trinh thong) OR (trinh trong)) quan vi kiem tra ))".
• Adding a wildcard symbol may retrieve word variants: (( tin luong quan van hieu suat ) or ( ((trinh thong) OR (trinh trong)) quan vi kiem tra ))*.