Perhaps you should try some spelling variations:
hien soat » thien hoat, bien soan, hien luat
kiem soat » kiem toan
tinh dung » tin dung, tinh quang, tinh huong
dung dat » dung va, dung tai
van hieu » cao hieu
hieu hoa » tieu hoa, dieu hoa, hiep hoa
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 ((hien soat) OR (kiem soat)) ) or ( tinh dung dat van hieu hoa ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dung luan van ((hien soat) OR (kiem soat)) ) OR ( tinh dung dat van hieu hoa ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( trinh dung luan van ((hien soat) OR (kiem soat)) ) or ( tinh dung dat van hieu hoa ))*".