Perhaps you should try some spelling variations:
trinh dang » trinh dung, trinh dan, trinh bang
thiet hoat » thien hoat, trien hoat, thiet hai
tran thang » tran thanh, tran thong, toan thang
thang luan » tang luan, hang luan, thong luan
dang dung » dan dung, dang hung, dang quang
hieu soat » hieu suat, hieu hoat, hieu luat
van hieu » cao hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( trinh dang dung va thiet hoat ) or ( tran thang luan van hieu soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dang dung va thiet hoat ) OR ( tran thang luan van hieu soat ))*.