Perhaps you should try some spelling variations:
hieu soat » hieu suat, hieu hoat, hieu luat
tin duong » tim duong, tin huong, tin tuong
van hieu » cao hieu
cua kien » cua bien, cua vien, cuu kien
kien hoa » dien hoa, tien hoa, kien ha
qua cua » quan cua, quang cua, qua quan
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 ( tin duong qua cua kien hoa ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung luan van hieu soat ) OR ( tin duong qua cua kien hoa )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung luan van hieu soat ) or ( tin duong qua cua kien hoa ))*.