Perhaps you should try some spelling variations:
hieu soat » hieu suat, hieu luat, kiem soat
hieu hoat » hieu hoa, thien hoat, hieu luat
quang tan » quang tuan, quang tran, quang toan
hien soat » thien hoat, kiem soat, bien soan
van hien » van hieu, van tien
tan van » tran van, tang van, dang 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: (( tin dung luan van ((hieu soat) OR (hieu hoat)) ) or ( tinh quang tan van hien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung luan van ((hieu soat) OR (hieu hoat)) ) OR ( tinh quang tan van hien soat )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tin dung luan van ((hieu soat) OR (hieu hoat)) ) or ( tinh quang tan van hien soat ))".
• Adding a wildcard symbol may retrieve word variants: (( tin dung luan van ((hieu soat) OR (hieu hoat)) ) or ( tinh quang tan van hien soat ))*.