Perhaps you should try some spelling variations:
trinh tang » trinh trang, trinh tong, trinh bang
dung toan » dung doanh, dung thang, dung thanh
hieu soat » hieu suat, hieu hoat, hieu luat
tang luan » dung luan
kiem soat » kiem toan
toan cau » toan cao, toan ban, toan tap
cau hieu » cao hieu, cau dieu, cau hien
luan va » luan van, luat va
va kiem » van kien

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( (tin OR tinh) dung toan cau hieu soat ) OR ( trinh tang luan va kiem soat ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( (tin OR tinh) dung toan cau hieu soat ) or ( trinh tang luan va kiem soat ))~".
• Adding a wildcard symbol may retrieve word variants: (( (tin OR tinh) dung toan cau hieu soat ) or ( trinh tang luan va kiem soat ))*.