Perhaps you should try some spelling variations:
trinh han » trinh quan
hieu suat » hieu luat, hieu qua
kiem toan » ke toan, kiem tra
dung lan » dung luan, dung land, dung lam
van hieu » cao hieu
ban kiem » bang kiem, van kiem, ban kem
lan van » luan van, lang van, tan van
han van » phan van, nhan van, hanh van
tin » tinh

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 lan van hieu suat ) or ( trinh han van ban kiem toan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung lan van hieu suat ) OR ( trinh han van ban kiem toan ))*.