Perhaps you should try some spelling variations:
hien soan » bien soan, thien toan, dien toan
kien soat » kiem soat, bien soan, dien hoat
kien hoa » dien hoa, tien hoa, kien ha
dung dat » dung va, dung tai
van hien » van hieu, van tien
dat van » dao van, dat va, dam van
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: (( trinh dung luan van ((kien soat) or (kien hoa)) ) or ( trinh dung dat van hien soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dung luan van ((kien soat) OR (kien hoa)) ) OR ( trinh dung dat van hien soan )).
• Adding a wildcard symbol may retrieve word variants: (( trinh dung luan van ((kien soat) or (kien hoa)) ) or ( trinh dung dat van hien soan ))*.