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