Perhaps you should try some spelling variations:
trinh dang » trinh dung, trinh dan, trinh bang
hieu soat » hieu suat, hieu hoat, hieu luat
dang cong » dung cong
cong xuan » dong xuan, cong luan, cong tuan
xuan kien » xuan dien, xuan kieu, xuan vien
kien soat » kiem soat, bien soan, kien hoa
van hieu » cao hieu
luan » quan, lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( (tin OR tinh) dung luan van hieu soat ) or ( trinh dang cong xuan kien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( (tin OR tinh) dung luan van hieu soat ) OR ( trinh dang cong xuan kien soat )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( (tin OR tinh) dung luan van hieu soat ) or ( trinh dang cong xuan kien soat ))".
• Adding a wildcard symbol may retrieve word variants: (( (tin OR tinh) dung luan van hieu soat ) or ( trinh dang cong xuan kien soat ))*.